Centered pentachoral numbers.

Terms

a(0) =1a(1) =21a(2) =121a(3) =421a(4) =1101a(5) =2401a(6) =4621a(7) =8121a(8) =13321a(9) =20701a(10) =30801a(11) =44221a(12) =61621a(13) =83721a(14) =111301a(15) =145201a(16) =186321a(17) =235621a(18) =294121a(19) =362901a(20) =443101a(21) =535921a(22) =642621a(23) =764521a(24) =903001a(25) =1059501a(26) =1235521a(27) =1432621a(28) =1652421a(29) =1896601