A026582 a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=n, T given by A026568.

1, 3, 8, 20, 50, 125, 314, 792, 2003, 5079, 12897, 32798, 83478, 212657, 542040, 1382376, 3526916, 9001805, 22982298, 58691692, 149919707, 383028163, 978768731, 2501494110, 6394118165, 16346237219, 41793150985, 106865638630

Offset

0,2

Links

Table of n, a(n) for n=0..27.

Formula

Conjecture: n*a(n) +2*(-2*n+1)*a(n-1) +2*(-n+3)*a(n-2) +20*(n-2)*a(n-3) +(-7*n+6)*a(n-4) +2*(-12*n+41)*a(n-5) +8*(2*n-7)*a(n-6)=0. - R. J. Mathar, Jun 23 2013

Crossrefs

Sequence in context: A178167 A078053 A122595 * A187003 A101893 A140662

Adjacent sequences: A026579 A026580 A026581 * A026583 A026584 A026585

Keyword

nonn

Author

Clark Kimberling

Status

approved