a(n) = binomial(n+4,n)*binomial(n+9,n).

Terms

a(0) =1a(1) =50a(2) =825a(3) =7700a(4) =50050a(5) =252252a(6) =1051050a(7) =3775200a(8) =12033450a(9) =34763300a(10) =92470378a(11) =229265400a(12) =534952600a(13) =1183859600a(14) =2500601400a(15) =5067885504a(16) =9898213875a(17) =18700431750a(18) =34284124875a(19) =61160599500a(20) =106419443130a(21) =180985447500a(22) =301393121250a(23) =492256440000a(24) =789661372500