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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
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
CROSSREFS
Cf. A049828.
Sequence in context: A031336 A099958 A213483 * A083800 A075829 A119248
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Aug 07 2021
STATUS
approved