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A012393
arctanh(tan(x)*tan(x))=2/2!*x^2+16/4!*x^4+512/6!*x^6+34816/8!*x^8...
+0
3
2, 16, 512, 34816, 4063232, 724566016, 183240753152, 62382319599616, 27507470234550272, 15250953398036463616, 10384044045105304174592, 8517992937742473694806016, 8285310016381680852100186112
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Maintained by
N. J. A. Sloane
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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.
AT&T Labs Research
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