Main diagonal of number array A082105.

Terms

a(0) =1a(1) =6a(2) =33a(3) =118a(4) =321a(5) =726a(6) =1441a(7) =2598a(8) =4353a(9) =6886a(10) =10401a(11) =15126a(12) =21313a(13) =29238a(14) =39201a(15) =51526a(16) =66561a(17) =84678a(18) =106273a(19) =131766a(20) =161601a(21) =196246a(22) =236193a(23) =281958a(24) =334081a(25) =393126a(26) =459681a(27) =534358a(28) =617793a(29) =710646