a(n) = Sum_{k=1..n*(n+1)/2} k * A214670(n,k).

A214669

a(n) = Sum_{k=1..n*(n+1)/2} k * A214670(n,k).

Terms

    a(0) =1a(1) =-4a(2) =36a(3) =-720a(4) =29264a(5) =-2370368a(6) =379341376a(7) =-119616350464

External references