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A102290
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Total number of even lists in all sets of lists, cf. A000262.
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0
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0, 2, 6, 60, 380, 3990, 37002, 450296, 5373720, 76018410, 1096730030, 17814654132, 299645294676, 5511836578430, 105550556136690, 2171244984679920, 46545825736022192, 1059273836225051346, 25100215228045842390
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| E.g.f.: x^2/(1-x^2)*exp(x/(1-x)).
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MAPLE
| Gser:=series(x^2*exp(x/(1-x))/(1-x^2), x=0, 22):seq(n!*coeff(Gser, x^n), n=1..21); (Deutsch)
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CROSSREFS
| Cf. A052852, A066897, A066898, A059570, A059570, A081358, A092691.
Sequence in context: A074167 A083787 A138286 * A025540 A083135 A056604
Adjacent sequences: A102287 A102288 A102289 * A102291 A102292 A102293
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KEYWORD
| easy,nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 19 2005
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 27 2005
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