Triangular numbers with tetrahedral indices: a(n) = (1/72) * (n*(n+1)*(n+2)*(n+3)*(n^2+2)).

Terms

a(0) =0a(1) =1a(2) =10a(3) =55a(4) =210a(5) =630a(6) =1596a(7) =3570a(8) =7260a(9) =13695a(10) =24310a(11) =41041a(12) =66430a(13) =103740a(14) =157080a(15) =231540a(16) =333336a(17) =469965a(18) =650370a(19) =885115a(20) =1186570a(21) =1569106a(22) =2049300a(23) =2646150a(24) =3381300a(25) =4279275a(26) =5367726a(27) =6677685a(28) =8243830a(29) =10104760