OFFSET
0,7
FORMULA
O.g.f.: A(x)/(1-y*x) where A(x) is o.g.f. for A002494.
EXAMPLE
1,
0, 1,
1, 0, 1,
2, 1, 0, 1,
7, 2, 1, 0, 1,
23, 7, 2, 1, 0, 1,
122, 23, 7, 2, 1, 0, 1
MATHEMATICA
Needs["Combinatorica`"]; nn=10; s=Sum[NumberOfGraphs[n]x^n, {n, 0, nn}]; CoefficientList[Series[s (1-x)/(1-y x), {x, 0, nn}], {x, y}] //Grid
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Geoffrey Critzer, Oct 09 2012
STATUS
approved