a(n) = permanent of the n X n matrix with entries a(i, i) = i*(i+1)/2 and a(i, j) = 1 elsewhere.

A303001

a(n) = permanent of the n X n matrix with entries a(i, i) = i*(i+1)/2 and a(i, j) = 1 elsewhere.

Terms

    a(0) =1a(1) =4a(2) =30a(3) =356a(4) =6106a(5) =142760a(6) =4363848a(7) =168986136a(8) =8087082144a(9) =468807362736

External references