A000810 - OEIS

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A000810

Expansion of (sin x + cos x)/cos 3x.

1, 1, 8, 26, 352, 1936, 38528, 297296, 7869952, 78098176, 2583554048, 31336418816, 1243925143552, 17831101321216, 825787662368768, 13658417358350336, 722906928498737152, 13551022195053101056 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	LINKS	`R. J. Mathar, Table of n, a(n) for n = 1..200`
	FORMULA	`(-1)^na(2n+1)=1-sum_{i=0,1,...,n-1} (-1)^ibinomial(2n+1,2i+1)3^(2n-2i)a(2i+1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 19 2006`
	CROSSREFS	`a(2n) = A000436(n). Cf. A007286, A007289.` `Sequence in context: A194997 A089064 A203635 * A171740 A129663 A112646` `Adjacent sequences: A000807 A000808 A000809 * A000811 A000812 A000813`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.