A049833 a(n) = T(2n-1,n) + T(2n,n+1) + ... + T(3n-3,2n-2) = sum over a period of n-th diagonal of array T given by A049828.

0, 1, 5, 13, 23, 40, 54, 80, 104, 131, 161, 209, 231, 288, 332, 376, 426, 499, 549, 631, 673, 748, 826, 940, 972, 1073, 1177, 1261, 1347, 1490, 1526, 1688, 1774, 1899, 2031, 2133, 2219, 2398, 2538, 2680, 2766, 2981, 3039, 3281, 3379, 3516, 3724, 3950, 4002

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A049828.

Extensions

More terms from Sean A. Irvine, Aug 07 2021