5-dimensional pyramidal numbers: a(n) = n*(n+1)*(n+2)*(n+3)*(2n+3)/5!.

Terms

a(0) =1a(1) =7a(2) =27a(3) =77a(4) =182a(5) =378a(6) =714a(7) =1254a(8) =2079a(9) =3289a(10) =5005a(11) =7371a(12) =10556a(13) =14756a(14) =20196a(15) =27132a(16) =35853a(17) =46683a(18) =59983a(19) =76153a(20) =95634a(21) =118910a(22) =146510a(23) =179010a(24) =217035a(25) =261261a(26) =312417a(27) =371287a(28) =438712a(29) =515592