(Nearest integer to n^6/36) / 2.

Terms

a(0) =0a(1) =1a(2) =10a(3) =57a(4) =217a(5) =648a(6) =1634a(7) =3641a(8) =7381a(9) =13889a(10) =24605a(11) =41472a(12) =67039a(13) =104577a(14) =158203a(15) =233017a(16) =335244a(17) =472392a(18) =653415a(19) =888889a(20) =1191196a(21) =1574721a(22) =2056054a(23) =2654208a(24) =3390842a(25) =4290497a(26) =5380840a(27) =6692921a(28) =8261435a(29) =10125000