A091031 Third to last entries in rows of array A090452 (scaled (3,2)-Stirling2).

1, 16, 114, 644, 3270, 15642, 72072, 323752, 1428102, 6214520, 26761196, 114287736, 484816540, 2045277990, 8588492100, 35923392720, 149753379270, 622458753840, 2580709189740, 10675646755800, 44074384410420

Offset

2,2

Links

Table of n, a(n) for n=2..22.

Formula

a(n)= A090452(n, 2*(n-1)), n>=2.

a(n)= (9*n^2-19*n+8)*(n-1)*C(n)/(4*(2*n-1)), n>=2; with the Catalan numbers C(n)=A000108(n).

Crossrefs

Cf. A000108 (last row entries), 3*A002054(n-1) (second to last row entries).

Sequence in context: A253460 A081194 A121148 * A265214 A055994 A293876

Adjacent sequences: A091028 A091029 A091030 * A091032 A091033 A091034

Keyword

nonn,easy

Author

Wolfdieter Lang, Jan 09 2004

Status

approved