A348024 a(n) = [x^n] Product_{k=1..2*n} (x + (-1)^k * k).
1, 1, -13, -87, 2609, 34965, -1638841, -33411007, 2128380881, 58501278297, -4709853961605, -163166745402375, 15875893807564465, 664163782026582877, -75766955207796981345, -3716140360596415682175, 486265092408065178623265, 27363821966293458296896305, -4039473192629570940395992765
Offset: 0
Keywords
Links
- Seiichi Manyama, Table of n, a(n) for n = 0..350
Programs
-
PARI
a(n) = polcoef(prod(k=1, 2*n, x+(-1)^k*k), n);
Formula
a(n) = A047991(2*n,n).