A152809 Column 4 of triangle A152798; a(n) = A152798(n+4,4).

1, 1, 5, 15, 49, 180, 685, 2748, 11683, 52262, 245357, 1207538, 6217803, 33428738, 187323142, 1092328063, 6618105311, 41600580908, 270931087106, 1825820975565, 12716770294407, 91437668751232, 678020392413506, 5179601279549207

Offset

0,3

Links

Table of n, a(n) for n=0..23.

Formula

a(n) = A152798(n+3,4) + 4*A152798(n+3,5) + 6*A152798(n+3,6) + 4*A152798(n+3,7) + A152798(n+3,8) for n>0 with a(0)=1.

Crossrefs

Cf. A152798; A122889, A152799, A152808.

Sequence in context: A126945 A191641 A199892 * A344204 A034539 A340395

Adjacent sequences: A152806 A152807 A152808 * A152810 A152811 A152812

Keyword

nonn

Author

Paul D. Hanna, Jan 01 2009

Status

approved