a(n) = binomial(n+8,8)*binomial(n+12,8).

Terms

a(0) =495a(1) =11583a(2) =135135a(3) =1061775a(4) =6370650a(5) =31286970a(6) =131405274a(7) =486370170a(8) =1621233900a(9) =4946841900a(10) =13992495660a(11) =37058912748a(12) =92647281870a(13) =220089696750a(14) =499568676750