a(n) = A322227(n) / (n*(n+1)/2), where A322227(n) = [x^(n-1)] Product_{k=1..n} (k + x - k*x^2), for n >= 1.
A322226
a(n) = A322227(n) / (n*(n+1)/2), where A322227(n) = [x^(n-1)] Product_{k=1..n} (k + x - k*x^2), for n >= 1.
Terms
- a(0) =1a(1) =1a(2) =-2a(3) =-14a(4) =36a(5) =736a(6) =-1819a(7) =-88227a(8) =163185a(9) =19160769a(10) =-15294993a(11) =-6611719113a(12) =-4120456053
External references
- oeis: A322226