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A024233
Expansion of tan(tanh(x))*sin(x)/2.
0
0, 1, -2, -21, 668, -8363, -597350, 76652415, -5349200200, 94006240681, 53961261562294, -13137846911653101, 1863043894828247636, -101535637135541768963, -32156707726436068717742
OFFSET
0,3
MATHEMATICA
Tan[ Tanh[ x ] ]*Sin[ x ]/2 (* Even Part *)
CROSSREFS
Cf. A009717.
Sequence in context: A060319 A095224 A034984 * A015209 A342267 A376689
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs Mar 1997
STATUS
approved