A107875 Column 1 of triangle A107873; a(n) = C( n*(n+1)/2 + n+3, n).

1, 5, 28, 220, 2380, 33649, 593775, 12620256, 314457495, 8996462475, 290752384208, 10477677064400, 416579843773639, 18114175790089400, 855130180330364620, 43553532185070076800, 2380434572658017204175

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Mathematica

Table[Binomial[(n(n+1))/2+n+3, n], {n, 0, 20}] (* Harvey P. Dale, Feb 27 2013 *)

Prog

(PARI) a(n)=binomial(n*(n+1)/2+n+3, n)

Crossrefs

Cf. A107873, A107874.

Sequence in context: A356025 A367272 A317968 * A340904 A038172 A183375

Adjacent sequences: A107872 A107873 A107874 * A107876 A107877 A107878

Keyword

nonn

Author

Paul D. Hanna, Jun 04 2005

Status

approved