A372794 Number of pairs of two disjoint sets of n positive integers with product A354457(n).

1, 1, 3, 4, 31, 15, 55, 110, 280, 797, 1419, 3557, 5647, 19559, 59708, 360726, 346487, 2018032, 2106172, 13228494, 13994982, 65426469, 110980446, 257148638, 660593345, 1966842579, 3909078573, 20820932559, 26864715089, 144689720443, 307476230099, 571509614773

Offset

2,3

Links

Table of n, a(n) for n=2..33.

Zhao Hui Du, C++ Source Code.

Example

For n=2, there exists only one pair of sets <{1,6},{2,3}> with product 1*6=2*3, so a(2)=1.

Crossrefs

Cf. A354457.

Sequence in context: A151466 A347978 A127068 * A058603 A042653 A219679

Adjacent sequences: A372791 A372792 A372793 * A372795 A372796 A372797

Keyword

nonn

Author

Zhao Hui Du, May 13 2024

Status

approved