a(n) = n*(n+1)*(n+2)*(n+3)*(n+4)*(n+5)/5.

Terms

a(0) =0a(1) =144a(2) =1008a(3) =4032a(4) =12096a(5) =30240a(6) =66528a(7) =133056a(8) =247104a(9) =432432a(10) =720720a(11) =1153152a(12) =1782144a(13) =2673216a(14) =3907008a(15) =5581440a(16) =7814016a(17) =10744272a(18) =14536368a(19) =19381824a(20) =25502400a(21) =33153120a(22) =42625440a(23) =54250560a(24) =68402880a(25) =85503600a(26) =106024464a(27) =130491648a(28) =159489792a(29) =193666176