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 A013506 tan(sec(x) - sech(x)) = 2/2!*x^2 + 362/6!*x^6 + 1199762/10!*x^10 ... 0
 2, 362, 1199762, 19881945722, 1018678051268642, 125201903398211562122, 31486196823329536613622962, 14521097220214080357933048011162, 11334671748951741252208875241156729922, 14082992180269280951672083015859201930825642, 26533369529542348661168440120005660275350301107922 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS MAPLE seq(coeff(series(tan(sec(x)-sech(x)), x, 100), x, 2+4*n)*(2+4*n)!, n=0..23); # Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 13 2010 MATHEMATICA With[{nn=50}, Take[CoefficientList[Series[Tan[Sec[x]-Sech[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] (* Harvey P. Dale, Mar 07 2019 *) CROSSREFS Sequence in context: A325629 A062381 A077350 * A013512 A295174 A320445 Adjacent sequences:  A013503 A013504 A013505 * A013507 A013508 A013509 KEYWORD nonn AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) EXTENSIONS More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 13 2010 Further terms from N. J. A. Sloane, Dec 17 2011 STATUS approved

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Last modified February 24 22:04 EST 2020. Contains 332216 sequences. (Running on oeis4.)