a(n) = binomial(n+6, 6) * binomial(n+8, 6).

Terms

a(0) =28a(1) =588a(2) =5880a(3) =38808a(4) =194040a(5) =792792a(6) =2774772a(7) =8588580a(8) =24048024a(9) =61941880a(10) =148660512a(11) =335785632a(12) =719540640a(13) =1472290848a(14) =2891999880a(15) =5477788008a(16) =10042611348a(17) =17877713700a(18) =30988037080a(19) =52423371000a(20) =86736850200a(21) =140610670200a(22) =223698793500a(23) =349748200620a(24) =538074154800