A280517 - OEIS

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A280517

Number of sequences of n positive integers with reciprocals adding up to an integer.

1, 2, 14, 263, 13462, 2104021, 1366427911, 6266456586228

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

Kassie Archer, Abigail Bishop, Alexander Diaz-Lopez, Luis David Garcia Puente, Darren Glass, Joel Louwsma, Arithmetical structures on bidents, arXiv:1903.01393 [math.CO], 2019.

CROSSREFS

Row sums of A280519.

Cf. A002967 (adding up to 1), A156871 (nondecreasing sequences), A280518 (increasing sequences).

Sequence in context: A156214 A370490 A187654 * A373222 A354511 A015197

Adjacent sequences: A280514 A280515 A280516 * A280518 A280519 A280520

KEYWORD

nonn,hard,more

AUTHOR

Max Alekseyev, Jan 04 2017

STATUS

approved

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