a(n) = 14*(n+1)*binomial(n+4,8).

Terms

a(0) =70a(1) =756a(2) =4410a(3) =18480a(4) =62370a(5) =180180a(6) =462462a(7) =1081080a(8) =2342340a(9) =4764760a(10) =9189180a(11) =16930368a(12) =29980860a(13) =51279480a(14) =85058820a(15) =137287920a(16) =216228474a(17) =333125100a(18) =503052550a(19) =745945200a(20) =1087836750a(21) =1562340780a(22) =2212405650a(23) =3092380200a(24) =4270429800a(25) =5831345520a(26) =7879792536