a(n) = C(n+5,5)*C(n+10,5).

Terms

a(0) =252a(1) =2772a(2) =16632a(3) =72072a(4) =252252a(5) =756756a(6) =2018016a(7) =4900896a(8) =11027016a(9) =23279256a(10) =46558512a(11) =88884432a(12) =162954792a(13) =288304632a(14) =494236512a(15) =823727520a(16) =1338557220a(17) =2125943820a(18) =3307023720a(19) =5047562520a(20) =7571343780a(21) =11176745580a(22) =16257084480a(23) =23325382080a(24) =33044291280