login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A009150 Expansion of e.g.f. cosh(sin(x)^2) (even coefficients). 1
1, 0, 12, -240, 5712, -266880, 18566592, -1488963840, 141287377152, -16736203345920, 2412897423240192, -402658140395089920, 76287123858146906112, -16430034737688309104640, 4011640516519571786022912, -1097783068806961397511290880 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
FORMULA
a(n) = (2*n)! * [x^(2*n)] cosh(sin(x)^2).
MAPLE
a:= n-> coeff(series(cosh(sin(x)^2), x, 2*n+1), x, 2*n)*(2*n)!:
seq ( a(n), n=0..20); # Alois P. Heinz, Aug 15 2012
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Cosh[Sin[x]^2], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 15 2012 *)
CROSSREFS
Sequence in context: A119837 A012538 A006588 * A009080 A002166 A034910
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
More terms from, and definition clarified by, Harvey P. Dale, Aug 15 2012
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 01:06 EDT 2024. Contains 371964 sequences. (Running on oeis4.)