OFFSET
4,2
REFERENCES
J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 146.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 4..50 (terms 4..37 from Sean A. Irvine)
M. L. Stein and P. R. Stein, Enumeration of Linear Graphs and Connected Linear Graphs up to p = 18 Points. Report LA-3775, Los Alamos Scientific Laboratory of the University of California, Los Alamos, NM, Oct 1967.
FORMULA
a(n) = A008406(n, n+1). - Andrew Howroyd, Jan 09 2024
PROG
(PARI) a(n) = polcoef(G(n, O(x^(n+2))), n+1) \\ G defined in A008406. - Andrew Howroyd, Jan 09 2024
CROSSREFS
KEYWORD
nonn,easy,nice
AUTHOR
EXTENSIONS
More terms from Vladeta Jovovic, Jan 07 2000
More terms from Sean A. Irvine, Jun 06 2017
STATUS
approved