OFFSET
0,3
EXAMPLE
1, 1, 2, 3, 5, 17/2, 89/6, 211/8, 1903/40, 62473/720, ...
MATHEMATICA
e[n_, x_]:=Sum[(-x)^k/k!, {k, 0, n}]; a[n_]:=Ceiling[(-1)^n*n!*(e[n, 2]-e[n, 1]e[n-1, 1])]; Array[a, 38, 0] (* Stefano Spezia, Apr 12 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 08 2001
EXTENSIONS
a(0)=1 prepended by and a(37) from Stefano Spezia, Apr 12 2024
STATUS
approved