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A009422
Expansion of log(1+x)*log(1+tan(x)).
10
0, 0, 2, -6, 30, -160, 1084, -8316, 74456, -749184, 8474240, -106035424, 1459781056, -21914009728, 356711937152, -6258266154752, 117778607150592, -2366994133647360, 50601711980789760, -1146653711692951552
OFFSET
0,3
FORMULA
a(n) ~ (n-1)! * (-1)^n * (4/Pi)^n * log(4/(4-Pi)). - Vaclav Kotesovec, Jan 23 2015
MATHEMATICA
Log[ 1+x ]*Log[ 1+Tan[ x ] ]
CoefficientList[Series[Log[1 + x]*Log[1 + Tan[x]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
Sequence in context: A357582 A218940 A005432 * A057221 A377065 A180892
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved