A012870 Numerator of [x^(4n+2)] in the Taylor series -log(cot(x)*tanh(x))= 2*x^2/3 +124*x^6/2835 +292*x^10/66825 +65528*x^14/127702575 -...

2, 124, 292, 65528, 22998766228, 26598037736, 176612002738088, 14801902575616661729776, 32359766312586630724, 169555914608329772744042648, 26741840557472966493223060731901928

Offset

0,1

Comments

The inner function is cot(x)*tanh(x) = 1 -2*x^2/3 +2*x^4/9 -88*x^6/945 +106*x^8/2835 -2368*x^10/155925 +...

Links

Table of n, a(n) for n=0..10.

Crossrefs

Sequence in context: A024244 A088055 A065705 * A183720 A042921 A123006

Adjacent sequences: A012867 A012868 A012869 * A012871 A012872 A012873

Keyword

nonn,frac

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Extensions

Values replaced by numerators. - R. J. Mathar, Dec 22 2011

Status

approved