a(n) = binomial(n+6,6)*binomial(n+9,9).

Terms

a(0) =1a(1) =70a(2) =1540a(3) =18480a(4) =150150a(5) =924924a(6) =4624620a(7) =19631040a(8) =73002930a(9) =243343100a(10) =739763024a(11) =2078672960a(12) =5456516520a(13) =13495999440a(14) =31674284400a(15) =70950397056a(16) =152432493675a(17) =315413948850a(18) =630827897700