Tricapped prism numbers.

Terms

a(0) =1a(1) =9a(2) =33a(3) =82a(4) =165a(5) =291a(6) =469a(7) =708a(8) =1017a(9) =1405a(10) =1881a(11) =2454a(12) =3133a(13) =3927a(14) =4845a(15) =5896a(16) =7089a(17) =8433a(18) =9937a(19) =11610a(20) =13461a(21) =15499a(22) =17733a(23) =20172a(24) =22825a(25) =25701a(26) =28809a(27) =32158a(28) =35757a(29) =39615