A348023 a(n) = [x^n] Product_{k=0..2*n-1} (x + (-1)^k * k).
1, -1, -5, 51, 1009, -17765, -636385, 15875083, 828730833, -26734633497, -1837389309405, 72689703927555, 6202163408816881, -290609121018808813, -29631450442239587305, 1604436906627413556075, 190333687041180914380065, -11692931012450127257939505, -1582217617564533519968758645
Offset: 0
Keywords
Links
- Seiichi Manyama, Table of n, a(n) for n = 0..351
Programs
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PARI
a(n) = polcoef(prod(k=0, 2*n-1, x+(-1)^k*k), n);
Formula
a(n) = A047991(2*n-1,n) for n>0.