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 A009606 Expansion of e.g.f. sinh(tan(x))*sin(x) (even powers only). 2
 0, 2, 8, 168, 5760, 310304, 23894144, 2481859968, 333725331456, 56329065984512, 11650274400684032, 2895770490247219200, 851263005980215443456, 292012329049579197046784, 115560631410392130840461312, 52240866338892496235877335040 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for n = 0..239 FORMULA a(n) = 2*A024259(n). MAPLE seq(factorial(k) * coeftayl(sinh(tan(x))*sin(x), x = 0, k), k=0..30, 2); # Muniru A Asiru, Feb 01 2018 MATHEMATICA With[{nn=40}, Take[CoefficientList[Series[Sinh[Tan[x]]Sin[x], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Dec 27 2011 *) PROG (PARI) x='x+O('x^40); v=Vec(serlaplace(sinh(tan(x))*sin(x))); concat([0], vector(#v\2, n, v[2*n-1])) \\ G. C. Greubel, Jan 30 2018 *) CROSSREFS Cf. A024259. Sequence in context: A012540 A346164 A175538 * A009682 A076548 A167009 Adjacent sequences: A009603 A009604 A009605 * A009607 A009608 A009609 KEYWORD nonn AUTHOR R. H. Hardin EXTENSIONS Extended and signs tested by Olivier Gérard, Mar 15 1997 More terms from Harvey P. Dale, Dec 27 2011 STATUS approved

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)