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A000807
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Quadratic invariants.
(Formerly M2071 N0819)
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3
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1, 2, 14, 182, 3614, 99302, 3554894, 159175382, 8654995454, 558786468422, 42086200603694, 3645412584724022, 358877175474325214, 39758874175808713382, 4915216680878167372814, 673139563824188490513302
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
J. Touchard, Nombres exponentiels et nombres de Bernoulli, Canad. J. Math., 8 (1956), 305-320.
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FORMULA
| E.g.f.: exp(exp(x)+exp(-x)-2). a(n) = Sum_{k=0..n} (-1)^k*binomial(n, k)*A000110(k)*A000110(n-k). - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 08 2002
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CROSSREFS
| Sequence in context: A141012 A167014 A109520 * A191565 A191236 A074655
Adjacent sequences: A000804 A000805 A000806 * A000808 A000809 A000810
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 08 2002
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