A013371 - OEIS

A013371

Expansion of tan(sinh(x)-sin(x)) = 2/3!*x^3 + 2/7!*x^7 + 4480/9!*x^9 + 2/11!*x^11 + ...

0, 2, 0, 2, 4480, 2, 274560, 717516802, 20650240, 397299302402, 1260764869707520, 211694311628802, 3189730834295158400, 12098583209553471488002, 6723227372694939050880

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

nn = 20; Table[(CoefficientList[Series[-Tan[Sin[x] - Sinh[x]], {x, 0, 2*nn+1}], x] * Range[0, 2*nn+1]!)[[n]], {n, 2, 2*nn, 2}] (* Vaclav Kotesovec, Feb 06 2015 *)

CROSSREFS

Sequence in context: A012622 A013370 A013374 * A013372 A209640 A080300

Adjacent sequences: A013368 A013369 A013370 * A013372 A013373 A013374

KEYWORD

nonn

AUTHOR

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

EXTENSIONS

a(0)=0 prepended by Vaclav Kotesovec, Feb 06 2015

Definition modified by Vaclav Kotesovec, Feb 06 2015

STATUS

approved