a(n) = Sum_{i=1..n} C(7+i,8)^2.

Terms

a(0) =1a(1) =82a(2) =2107a(3) =29332a(4) =274357a(5) =1930726a(6) =10948735a(7) =52357960a(8) =217994860a(9) =808970960a(10) =2723733524a(11) =8436372248a(12) =24304813148a(13) =65712993248a(14) =167965846148a(15) =408373664744a(16) =949291256585