4-dimensional figurate numbers: a(n) = (5*n-1)*binomial(n+2,3)/4.

Terms

a(0) =0a(1) =1a(2) =9a(3) =35a(4) =95a(5) =210a(6) =406a(7) =714a(8) =1170a(9) =1815a(10) =2695a(11) =3861a(12) =5369a(13) =7280a(14) =9660a(15) =12580a(16) =16116a(17) =20349a(18) =25365a(19) =31255a(20) =38115a(21) =46046a(22) =55154a(23) =65550a(24) =77350a(25) =90675a(26) =105651a(27) =122409a(28) =141085a(29) =161820