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A009173 Expansion of cosh(tanh(x)*tan(x)). 0
1, 12, 7952, 31111872, 414147567872, 13936708915940352, 987956358173680013312, 130572314003924554412900352, 29485421729721202391180048924672, 10655360784935131422152244665663619072 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

MATHEMATICA

Cosh[ Tanh[ x ]*Tan[ x ] ] (* [ x^(4n) ] *)

CROSSREFS

Sequence in context: A167072 A107251 A201493 * A012531 A013481 A013513

Adjacent sequences:  A009170 A009171 A009172 * A009174 A009175 A009176

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net)

EXTENSIONS

Reformated Mar 15 1997 by Olivier Gerard.

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Last modified February 14 14:07 EST 2012. Contains 205623 sequences.