A026580 T(n,0) + T(n,1) + ... + T(n,n), T given by A026568.

1, 2, 5, 12, 30, 75, 189, 478, 1211, 3076, 7818, 19901, 50680, 129179, 329383, 840336, 2144540, 5474889, 13980493, 35709394, 91228015, 233108456, 595740568, 1522725379, 3892624055, 9952119054, 25446913766, 65072487645

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A026568.

Formula

Conjecture: n*a(n) +(n-2)*a(n-1) +(-17*n+28)*a(n-2) +5*(-n+4)*a(n-3) +2*(34*n-107)*a(n-4) +16*(n-5)*a(n-5) +32*(-2*n+9)*a(n-6)=0. - R. J. Mathar, Jun 23 2013