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A008775 Expansion of 2(1 + cos x cosh x )^-1. +0
2
1, 2, 272, 261392, 923578112, 8687146706432, 179207715900772352, 7123449535546491471872, 497301503279765920504020992, 56869795869126246818618490355712 (list; graph; listen)
OFFSET

0,2

REFERENCES

Goulden and Jackson, Combin. Enum., Wiley, 1983 p. 287.

CROSSREFS

Cf. A101921.

Sequence in context: A007512 A048534 A135696 this_sequence A119553 A093938 A080296

Adjacent sequences: A008772 A008773 A008774 this_sequence A008776 A008777 A008778

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.


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