a(n) = (n+1)*binomial(n+1,13).

Terms

a(0) =13a(1) =196a(2) =1575a(3) =8960a(4) =40460a(5) =154224a(6) =515508a(7) =1550400a(8) =4273290a(9) =10943240a(10) =26313518a(11) =59907456a(12) =130007500a(13) =270415600a(14) =541574100a(15) =1048380480a(16) =1968053535a(17) =3592795500a(18) =6393845325a(19) =11115955200a(20) =18914492520a(21) =31551447840a(22) =51671823000a(23) =83188425600a(24) =131811290100