A376372 Numbers that occur exactly twice in A036038, i.e., numbers m such that the multinomial coefficient (x_1 + ... + x_k)!/(x_1! * ... * x_k!) is equal to m for exactly 2 integer partitions (x_1, ..., x_k).

10, 12, 15, 21, 24, 28, 35, 36, 42, 45, 55, 66, 70, 72, 78, 84, 91, 110, 126, 132, 136, 140, 153, 156, 165, 168, 171, 180, 182, 190, 220, 231, 240, 253, 272, 276, 280, 286, 300, 306, 325, 330, 336, 342, 351, 364, 378, 380, 406, 435, 455, 465, 496, 506, 528, 552

Offset

1,1

Comments

Numbers m such that A376369(m) = 2, i.e., numbers that appear exactly twice in A376367.

Links

Pontus von Brömssen, Table of n, a(n) for n = 1..10000

Example

10 is a term, because it can be represented as a multinomial coefficient in exactly 2 ways: 10 = 10!/(1!*9!) = 5!/(2!*3!).

Crossrefs

Second row of A376370.

Subsequence of A325472.

Cf. A036038, A376367, A376369.

Sequence in context: A072198 A057485 A162825 * A107836 A096128 A334939

Adjacent sequences: A376369 A376370 A376371 * A376373 A376374 A376375

Keyword

nonn

Author

Pontus von Brömssen, Sep 23 2024

Status

approved