A274901 - OEIS

A274901

Number of (not necessarily proper) face colorings of the truncated cube using at most n colors.

1, 554, 109152, 5747200, 128538250, 1640929626, 14167981324, 91769978112, 477063389475, 2084653722250, 7914860972876, 26756396132544, 82046630783572, 231537699283450, 608260629969000, 1501341920229376, 3508131297671589, 7809071314434282, 16646760371737000

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..19.

Marko R. Riedel et al., Truncated objects coloring, Mathematics Stack Exchange (Jul 10 2016).

Wikipedia, Truncated cube

FORMULA

a(n) = 1/48*n^14 + 1/8*n^10 + 1/16*n^9 + 1/16*n^8 + 7/48*n^7 + 1/6*n^6 + 1/8*n^5 + 1/8*n^4 + 1/6*n^3 = n^3*(n + 1)*(n^10 - n^9 + n^8 - n^7 + 7*n^6 - 4*n^5 + 7*n^4 + 8*n^2 - 2*n + 8)/48.

EXAMPLE

Cycle index: 1/48*s[1]^14 + 1/8*s[1]^6*s[2]^4 + 1/16*s[2]^5*s[1]^4 + 1/16*s[2]^6*s[1]^2 + 7/48*s[2]^7 + 1/6*s[1]^2*s[3]^4 + 1/8*s[4]^3*s[1]^2 + 1/8*s[4]^3*s[2] + 1/6*s[6]^2*s[2].

MATHEMATICA

Table[1/48 n^14 + 1/8 n^10 + 1/16 n^9 + 1/16 n^8 + 7/48 n^7 + 1/6 n^6 + 1/8 n^5 + 1/8 n^4 + 1/6 n^3, {n, 25}] (* Vincenzo Librandi, Jul 11 2016 *)

PROG

(Magma) [1/48*n^14+1/8*n^10+1/16*n^9+1/16*n^8+7/48*n^7+1/6*n^6+1/8*n^5+ 1/8*n^4+1/6*n^3: n in [1..20]]; // Vincenzo Librandi, Jul 11 2016

CROSSREFS

Cf. A274900, A274902.

Sequence in context: A276802 A205888 A186529 * A075808 A204365 A283158

Adjacent sequences: A274898 A274899 A274900 * A274902 A274903 A274904

KEYWORD

nonn,easy

AUTHOR

Marko Riedel, Jul 10 2016

STATUS

approved

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