Main diagonal of table A083050.

Terms

a(0) =1a(1) =6a(2) =15a(3) =33a(4) =60a(5) =107a(6) =176a(7) =283a(8) =463a(9) =732a(10) =1156a(11) =1773a(12) =2702a(13) =4170a(14) =6333a(15) =9611a(16) =14365a(17) =21842a(18) =32281a(19) =48041a(20) =71690a(21) =106136a(22) =158196a(23) =232380a(24) =340846a(25) =504318a(26) =740949a(27) =1089909a(28) =1590748a(29) =2348540