Centered icositetrachoral numbers.

Terms

a(0) =1a(1) =145a(2) =1009a(3) =3745a(4) =10081a(5) =22321a(6) =43345a(7) =76609a(8) =126145a(9) =196561a(10) =293041a(11) =421345a(12) =587809a(13) =799345a(14) =1063441a(15) =1388161a(16) =1782145a(17) =2254609a(18) =2815345a(19) =3474721a(20) =4243681a(21) =5133745a(22) =6157009a(23) =7326145a(24) =8654401a(25) =10155601a(26) =11844145a(27) =13735009a(28) =15843745a(29) =18186481