login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A013550 Numerator of the coefficient of [x^n] in the Taylor expansion exp(cot(x)-cosech(x))= 1-x/6 +x^2/72 -55*x^3/1296 +217*x^4/31104 -4219*x^5/6531840 +... 0
1, -1, 1, -55, 217, -4219, 214279, -802171, 824071, -109684277, 337533513773, -760100160121, 8320611986431, -265779449377027, 2303253020856673, -417652078505070229, 7111553692366818727, -7396136516120375032117 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

COMMENTS

The inner function is cot(x)-cosech(x) = -x/6 -x^3/24 -x^5/15120 -17*x^7/40320 -x^9/23950080 -691*x^11/159667200 -...

CROSSREFS

Cf. A013537, A013541 (bisections?)

Sequence in context: A189005 A105442 A158646 * A158658 A020182 A159746

Adjacent sequences:  A013547 A013548 A013549 * A013551 A013552 A013553

KEYWORD

sign,frac

AUTHOR

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

EXTENSIONS

Values replaced by numerators. - R. J. Mathar, Dec 21 2011

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 09:17 EST 2012. Contains 206009 sequences.