4-dimensional analog of centered polygonal numbers.

Terms

a(0) =1a(1) =8a(2) =31a(3) =85a(4) =190a(5) =371a(6) =658a(7) =1086a(8) =1695a(9) =2530a(10) =3641a(11) =5083a(12) =6916a(13) =9205a(14) =12020a(15) =15436a(16) =19533a(17) =24396a(18) =30115a(19) =36785a(20) =44506a(21) =53383a(22) =63526a(23) =75050a(24) =88075a(25) =102726a(26) =119133a(27) =137431a(28) =157760a(29) =180265