A048221 a(n)=T(2n-1,n), array T given by A048212.

2, 5, 18, 35, 60, 94, 134, 180, 232, 291, 357, 430, 515, 610, 710, 815, 932, 1053, 1181, 1318, 1462, 1615, 1776, 1944, 2116, 2300, 2496, 2696, 2907, 3128, 3351, 3581, 3817, 4062, 4318, 4582, 4852, 5131, 5419, 5719, 6031, 6346, 6665, 6991, 7323, 7665, 8015

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A004979.

Formula

a(n) = A004979(2*n) - A004979(n). - Sean A. Irvine, Jun 05 2021

Extensions

More terms from Sean A. Irvine, Jun 05 2021