The n-th n-gonal number divisible by n.

Terms

a(0) =1a(1) =4a(2) =15a(3) =64a(4) =210a(5) =630a(6) =1288a(7) =736a(8) =4959a(9) =9850a(10) =14421a(11) =6336a(12) =34840a(13) =57134a(14) =20805a(15) =28288a(16) =141933a(17) =208818a(18) =253099a(19) =89200a(20) =107856a(21) =583462a(22) =680340a(23) =56304a(24) =1045675a(25) =1367210a(26) =1553553a(27) =497056a(28) =2242164a(29) =687090