A027519 First diagonal of A027516.

1, 1, 2, 3, 15, 70, 154, 105, 77, 55, 165, 120, 4620, 62216, 95445, 72720, 28280, 43632, 239976, 3563280, 2820930, 372362760, 37310748552, 7078607624, 10642043052900, 2456049068550, 17265042532279080, 472434345656000280, 22811829833104013520

Offset

1,3

Links

Table of n, a(n) for n=1..29.

Formula

Numerators of sequence a[n, n] in A=(b[i, j])^2 where b[i, j] = A008284(i, j) / Partitions(i) if j<=i, 0 if j>i.

Crossrefs

Sequence in context: A323709 A338308 A047014 * A245107 A177012 A107413

Adjacent sequences: A027516 A027517 A027518 * A027520 A027521 A027522

Keyword

nonn

Author

Olivier Gérard

Extensions

More terms from Sean A. Irvine, Nov 06 2019

Status

approved