A027508 Second column of A027495.

1, 21, 227, 4283, 3303383, 4156965497, 2439821215787, 25768363425203859, 2832420937806122764581, 4560420339293289548844701, 1405739820979794860218217874663237, 16339745488551090702175554269302914589235, 511682012237090112121527245846398145676326299

Offset

2,2

Links

Table of n, a(n) for n=2..14.

Formula

Numerators of sequence a[ 2, n ] in (a[ i, j ])^2 where a[ i, j ] = S(i, j)/BellNumber(i) if j<=i, 0 if j>i.

Crossrefs

Sequence in context: A219140 A231513 A332908 * A221037 A221500 A161518

Adjacent sequences: A027505 A027506 A027507 * A027509 A027510 A027511

Keyword

nonn

Author

Olivier Gérard

Extensions

More terms from Sean A. Irvine, Nov 06 2019

Status

approved