Centered truncated cube numbers: a(n) = (46*n^3 - 69*n^2 + 29*n - 3)/3.

Terms

a(0) =1a(1) =49a(2) =235a(3) =651a(4) =1389a(5) =2541a(6) =4199a(7) =6455a(8) =9401a(9) =13129a(10) =17731a(11) =23299a(12) =29925a(13) =37701a(14) =46719a(15) =57071a(16) =68849a(17) =82145a(18) =97051a(19) =113659a(20) =132061a(21) =152349a(22) =174615a(23) =198951a(24) =225449a(25) =254201a(26) =285299a(27) =318835a(28) =354901a(29) =393589