a(n) = binomial(n+5, 5) * binomial(n+7, 5).

Terms

a(0) =21a(1) =336a(2) =2646a(3) =14112a(4) =58212a(5) =199584a(6) =594594a(7) =1585584a(8) =3864861a(9) =8744736a(10) =18582564a(11) =37425024a(12) =71954064a(13) =132838272a(14) =236618172a(15) =408282336a(16) =684723501a(17) =1119300336a(18) =1787771370a(19) =2795913120a(20) =4289184900a(21) =6464858400a(22) =9587091150a(23) =14005489680a(24) =20177780805a(25) =28697288256