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

1,1

Links

Table of n, a(n) for n=1..47.

Formula

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

Crossrefs

Cf. A004979.

Sequence in context: A288994 A226141 A355515 * A183365 A295905 A056296

Adjacent sequences: A048218 A048219 A048220 * A048222 A048223 A048224

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Jun 05 2021

Status

approved