Column 2 of triangle in A288180.

Terms

a(0) =13a(1) =37a(2) =121a(3) =265a(4) =587a(5) =1019a(6) =1797a(7) =2823a(8) =4369a(9) =6257a(10) =9001a(11) =12289a(12) =16775a(13) =21905a(14) =28383a(15) =35901a(16) =45463a(17) =56119a(18) =69351a(19) =84167a(20) =101687a(21) =120869a(22) =143777a(23) =168873a(24) =198191a(25) =229771a(26) =266015a(27) =305379a(28) =350673a(29) =399035