a(n) = binomial(n+8,8)*binomial(n+10,8).

Terms

a(0) =45a(1) =1485a(2) =22275a(3) =212355a(4) =1486485a(5) =8281845a(6) =38648610a(7) =156434850a(8) =563165460a(9) =1837398420a(10) =5512195260a(11) =15380181180a(12) =40281426900a(13) =99773995860a(14) =235181561670a(15) =530311364550