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A013535 Numerator of the coefficient [x^(2n)] in the Taylor series sec(cosec(x)-cosech(x))= 1 +x^2/18 +5*x^4/1944 +5449*x^6/3674160 +6973*x^8/52907904 +... 0
1, 1, 5, 5449, 6973, 518819753, 1489058191, 293416964947, 2531578641757, 8778884852410565513, 2503198198587351877067, 2378459715706347981795671, 2343990771779851025499037, 521048260968673067986908628597, 35145358095152621756454620279473 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

CROSSREFS

Cf. A068917.

Sequence in context: A177503 A072021 A196627 * A079812 A137694 A202156

Adjacent sequences:  A013532 A013533 A013534 * A013536 A013537 A013538

KEYWORD

nonn,frac

AUTHOR

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

EXTENSIONS

Values replaced by numerators. - R. J. Mathar, Dec 20 2011

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Last modified February 14 14:07 EST 2012. Contains 205623 sequences.