a(n) = n*binomial(n+4, 4).

Terms

a(0) =0a(1) =5a(2) =30a(3) =105a(4) =280a(5) =630a(6) =1260a(7) =2310a(8) =3960a(9) =6435a(10) =10010a(11) =15015a(12) =21840a(13) =30940a(14) =42840a(15) =58140a(16) =77520a(17) =101745a(18) =131670a(19) =168245a(20) =212520a(21) =265650a(22) =328900a(23) =403650a(24) =491400a(25) =593775a(26) =712530a(27) =849555a(28) =1006880a(29) =1186680