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A013472 Coefficient of [x^(4*n+2)] in e.g.f. tan(cosh(x) - cos(x)). 0
2, 242, 493922, 4867022162, 146803464634562, 10586916198380287922, 1560405836504795306526242, 421594801591208996367201480722, 192759827198349576131799688610789762 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..8.

EXAMPLE

(2/2!)*x^2 + (242/6!)*x^6 + (493922/10!)*x^10 + (4867022162/14!)*x^14 + ...

MAPLE

g := taylor(tan(cos(x)-cosh(x)), x=0, 100):q := seq(abs(coeff(g, x, 4*i+2)*(4*i+2)!), i=0..12);

CROSSREFS

Sequence in context: A109930 A309037 A013509 * A013505 A013478 A049333

Adjacent sequences:  A013469 A013470 A013471 * A013473 A013474 A013475

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

More terms from Sascha Kurz, Mar 24 2002

Missing a(0)=2 inserted and title improved by Sean A. Irvine, Aug 06 2018

STATUS

approved

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Last modified April 5 13:14 EDT 2020. Contains 333241 sequences. (Running on oeis4.)