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A052277 (4n+2)!/2^(2n+1). 6
1, 90, 113400, 681080400, 12504636144000, 548828480360160000, 49229914688306352000000, 8094874872198213459360000000, 2252447502438386084347676160000000, 997586474354936812896742294502400000000, 669959124447288464805194190141921792000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..10.

FORMULA

sin(x)*sinh(x)=sum(n>=0, (-1)^n*x^(4n+2)/a(n)) - Benoit Cloitre, Feb 02 2002

CROSSREFS

Sequence in context: A145413 A279442 A172572 * A172671 A066784 A135321

Adjacent sequences:  A052274 A052275 A052276 * A052278 A052279 A052280

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 05 2000

STATUS

approved

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Last modified March 21 01:18 EDT 2019. Contains 321356 sequences. (Running on oeis4.)