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 A052846 E.g.f.: (1-exp(x))*log(2-exp(x)). 0
 0, 0, 2, 9, 40, 215, 1446, 11893, 115844, 1302099, 16568290, 235237937, 3684998208, 63113398543, 1173013230494, 23509415868141, 505358483764732, 11597234229683147, 282970077651917658, 7314780938223880105 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Previous name was: A simple grammar. LINKS INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 814 FORMULA E.g.f.: log(-1/(-2+exp(x)))*exp(x)-log(-1/(-2+exp(x))) a(n) ~ (n-1)! / log(2)^n. - Vaclav Kotesovec, Sep 30 2013 MAPLE spec := [S, {B=Set(Z, 1 <= card), C=Cycle(B), S=Prod(B, C)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20); MATHEMATICA CoefficientList[Series[(1-E^x) * Log[2-E^x], {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Sep 30 2013 *) CROSSREFS Sequence in context: A038156 A296964 A261047 * A293152 A327827 A056844 Adjacent sequences:  A052843 A052844 A052845 * A052847 A052848 A052849 KEYWORD easy,nonn AUTHOR encyclopedia(AT)pommard.inria.fr, Jan 25 2000 EXTENSIONS New name, using e.g.f., by Vaclav Kotesovec, Sep 30 2013 STATUS approved

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Last modified August 5 22:41 EDT 2021. Contains 346488 sequences. (Running on oeis4.)