a(n) = binomial(n+3,n)*binomial(n+8,n).

Terms

a(0) =1a(1) =36a(2) =450a(3) =3300a(4) =17325a(5) =72072a(6) =252252a(7) =772200a(8) =2123550a(9) =5348200a(10) =12514788a(11) =27511848a(12) =57316350a(13) =113954400a(14) =217443600a(15) =400096224a(16) =712671399a(17) =1232995500a(18) =2077825750a(19) =3418915500a(20) =5504453955a(21) =8687301480a(22) =13461727500a(23) =20510685000a(24) =30766027500a(25) =45484495056