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A024289
Expansion of e.g.f. of tan(tan(x))*x/2 (even powers only).
0
0, 1, 8, 216, 11584, 1019520, 132672000, 23886564352, 5679985229824, 1723355387559936, 649567394309734400, 297722967189644902400, 163056718857998098759680, 105162437290880582018924544
OFFSET
0,3
FORMULA
a(n) = A009700(n) / 2.
MATHEMATICA
Tan[ Tan[ x ] ]*x/2 (* Even Part *)
CROSSREFS
Equals A009700/2.
Sequence in context: A362073 A009072 A002897 * A009106 A000442 A268471
KEYWORD
nonn
AUTHOR
EXTENSIONS
Extended and signs tested Mar 1997.
STATUS
approved