OFFSET
0,2
FORMULA
a(n) = A000041(n+4) - round((n+7)^2/12). - Vladeta Jovovic, Jun 18 2003
MAPLE
ZL :=[S, {S = Set(Cycle(Z), 3 < card)}, unlabelled]: seq(combstruct[count](ZL, size=n), n=4..41); # Zerinvary Lajos, Mar 25 2008
B:=[S, {S = Set(Sequence(Z, 1 <= card), card >=4)}, unlabelled]: seq(combstruct[count](B, size=n), n=4..41); # Zerinvary Lajos, Mar 21 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved