OFFSET
0,3
EXAMPLE
G.f. A(x) = 1 + x + 3*x^2 + 11*x^3 + 46*x^4 + 205*x^5 + 957*x^6 + 4614*x^7 + 22803*x^8 + 114898*x^9 + ...
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Mar 20 2018
STATUS
approved