a(n) = n * Sum_{d|n} binomial(d+4,5)/d.

Terms

a(0) =1a(1) =8a(2) =24a(3) =72a(4) =131a(5) =318a(6) =469a(7) =936a(8) =1359a(9) =2294a(10) =3014a(11) =5172a(12) =6201a(13) =9548a(14) =12126a(15) =17376a(16) =20366a(17) =29862a(18) =33668a(19) =47372a(20) =54684a(21) =71874a(22) =80753a(23) =111000a(24) =119410a(25) =154986a(26) =173988a(27) =220864a(28) =237365a(29) =309864