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 A012049 sec(sin(tanh(x))) = 1+1/2!*x^2-7/4!*x^4+73/6!*x^6+209/8!*x^8... 1
 1, 1, -7, 73, 209, -144271, 16935049, -1681509255, 121927140641, 7429711841377, -7368737635468135, 2672443484700215337, -714451608564077085455, 102412390388191040345041, 45342663705298790615837737, -56227306534265498361644426407 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..100 (terms n = 0..50 from Vincenzo Librandi) MATHEMATICA With[{nn=40}, Take[CoefficientList[Series[Sec[Sin[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Sep 25 2013 *) CROSSREFS Sequence in context: A082719 A188465 A142053 * A012158 A139966 A175205 Adjacent sequences: A012046 A012047 A012048 * A012050 A012051 A012052 KEYWORD sign AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) EXTENSIONS More terms from Harvey P. Dale, Sep 25 2013 STATUS approved

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Last modified December 7 23:30 EST 2023. Contains 367662 sequences. (Running on oeis4.)