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

1,3

Links

Table of n, a(n) for n=1..49.

Crossrefs

Cf. A049828.

Sequence in context: A031336 A099958 A213483 * A083800 A075829 A119248

Adjacent sequences: A049830 A049831 A049832 * A049834 A049835 A049836

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Aug 07 2021

Status

approved