a(n) = a(n,m) = Sum_{k=0..n} binomial(m*k,k)*binomial(m*(n-k),n-k) for m=7.

A079563

a(n) = a(n,m) = Sum_{k=0..n} binomial(m*k,k)*binomial(m*(n-k),n-k) for m=7.

Terms

    a(0) =1a(1) =14a(2) =231a(3) =3934a(4) =67851a(5) =1177974a(6) =20531770a(7) =358788696a(8) =6281076123a(9) =110103674128

External references