1,2

Also structured deltoidal hexacontahedral numbers (vertex structure 7) (Cf. A100158, A100166 = alternate vertices).

a(n)=(1/6)*(114*n^3-162*n^2+54*n)

Cf. A100158, A100160 = alternate vertices; A100145 for more on structured polyhedral numbers.

Sequence in context: A045220 A100158 A100166 this_sequence A100160 A010746 A020191

Adjacent sequences: A100156 A100157 A100158 this_sequence A100160 A100161 A100162

easy,nonn

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