1,2

a(n)=(1/6)*(11*n^3-3*n^2-2*n)

Cf. A100155, A100157 for adjacent structured Archimedean solids; A100145 for more on structured polyhedral numbers. Similar to truncated tetrahedral numbers A005906.

Sequence in context: A009519 A106808 A007899 this_sequence A009785 A135710 A070996

Adjacent sequences: A100153 A100154 A100155 this_sequence A100157 A100158 A100159

easy,nonn

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