OFFSET
0,4
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..594
FORMULA
a(n) = Sum_{k=0..n} A159881(n,k).
EXAMPLE
a(1) = 2-1=1. a(2)=3-3+1=1. a(3)=4-6+5-1=2.
MAPLE
MATHEMATICA
T[n_, 0]:= n + 1; T[n_, k_]:= T[n, k] = If[k < 0 || k > n, 0, k*T[n - 1, k] - T[n - 1, k - 1]]; Table[Sum[T[n, k], {k, 0, n}], {n, 0, 50}] (* G. C. Greubel, Jul 27 2018 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
R. J. Mathar, May 29 2009
STATUS
approved