Binomial coefficients C(2*n+7,7).

Terms

a(0) =1a(1) =36a(2) =330a(3) =1716a(4) =6435a(5) =19448a(6) =50388a(7) =116280a(8) =245157a(9) =480700a(10) =888030a(11) =1560780a(12) =2629575a(13) =4272048a(14) =6724520a(15) =10295472a(16) =15380937a(17) =22481940a(18) =32224114a(19) =45379620a(20) =62891499a(21) =85900584a(22) =115775100a(23) =154143080a(24) =202927725a(25) =264385836a(26) =341149446a(27) =436270780a(28) =553270671a(29) =696190560