1,2

a(n)=(1/6)*(13*n^3-9*n^2+12*n)

Cf. A100185 - structured anti-prisms; A100145 for more on structured numbers.

Sequence in context: A070996 A015237 A024223 this_sequence A050490 A159013 A022281

Adjacent sequences: A100180 A100181 A100182 this_sequence A100184 A100185 A100186

easy,nonn

James A. Record (james.record(AT)gmail.com). Nov 07, 2004.