Sum of all matrix elements of n X n matrix M[i,j]=(2n+i+j)!/(n+i)!/(n+j)!, i,j=1..n.

A120277

Sum of all matrix elements of n X n matrix M[i,j]=(2n+i+j)!/(n+i)!/(n+j)!, i,j=1..n.

Terms

    a(0) =6a(1) =160a(2) =2842a(3) =44868a(4) =681604a(5) =10248992a(6) =154149762a(7) =2327405740a(8) =35305388536a(9) =538000530912

External references