OFFSET
0,4
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..170
FORMULA
a(n) = n*A001205(n).
E.g.f.: x*A'(x) where A(x) = exp(-x/2-x^2/4)/sqrt(1-x) is the e.g.f. for A001205.
a(n) ~ sqrt(2) * n^(n+1) / exp(n+3/4). - Vaclav Kotesovec, Aug 22 2014
MAPLE
egf:= x *diff(exp(-x/2-x^2/4)/sqrt(1-x), x):
a:= n-> n! * coeff(series(egf, x, n+1), x, n):
seq(a(n), n=0..30); # Alois P. Heinz, May 18 2012
MATHEMATICA
nn = 20; a = Log[1/(1 - x)]/2 - x/2 - x^2/4; Drop[Range[0, nn]! CoefficientList[Series[x D[Exp[a], x], {x, 0, nn}], x], 3]
CROSSREFS
KEYWORD
nonn
AUTHOR
Geoffrey Critzer, May 18 2012
STATUS
approved