Truncated octahedral numbers: 16*n^3 - 33*n^2 + 24*n - 6.

Terms

a(0) =1a(1) =38a(2) =201a(3) =586a(4) =1289a(5) =2406a(6) =4033a(7) =6266a(8) =9201a(9) =12934a(10) =17561a(11) =23178a(12) =29881a(13) =37766a(14) =46929a(15) =57466a(16) =69473a(17) =83046a(18) =98281a(19) =115274a(20) =134121a(21) =154918a(22) =177761a(23) =202746a(24) =229969a(25) =259526a(26) =291513a(27) =326026a(28) =363161a(29) =403014