1,2

a(n)=(1/6)*(31*n^3-27*n^2+2*n)

Cf. A100151, A100153 for adjacent structured Archimedean solids; A100145 for more on structured polyhedral numbers. Similar to truncated cubic numbers A005912.

Sequence in context: A042124 A042126 A157514 this_sequence A048529 A100155 A027265

Adjacent sequences: A100149 A100150 A100151 this_sequence A100153 A100154 A100155

easy,nonn

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