a(n) = 288*binomial(2*n,n-5) + 8*Sum_{i=1..n-5} binomial(2*n,n-5-i)*(5+i).

A182026

a(n) = 288*binomial(2*n,n-5) + 8*Sum_{i=1..n-5} binomial(2*n,n-5-i)*(5+i).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =288a(6) =3504a(7) =26936a(8) =168000a(9) =930240a(10) =4775232a(11) =23279256a(12) =109368864a(13) =499928000a(14) =2237835600a(15) =9854764920a(16) =42836127360a(17) =184246957440a(18) =785668464000

External references