OFFSET
0,2
MAPLE
# Function BG_row is defined in A290694.
seq(BG_row(3, n, "den", "val"), n=0..20);
MATHEMATICA
P[n_, x_] := Sum[(-1)^(n-k)*StirlingS2[n, k]*k!*x^k, {k, 0, n}];
a[n_] := Integrate[P[n, x]^3, {x, 0, 1}] // Denominator;
Table[a[n], {n, 0, 21}] (* Jean-François Alcover, Jun 15 2019 *)
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Peter Luschny, Aug 24 2017
STATUS
approved