id:A079858 - OEIS Search Results

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Power series coefficients of 1/(cos(2x)-sin(2x)).

+0
2

1, 2, 12, 88, 912, 11552, 176832, 3150208, 64188672, 1470996992, 37459479552, 1049279715328, 32063706796032, 1061443378552832, 37841217707753472, 1445427909919080448, 58892032991566036992, 2549444593020567683072 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`E.g.f.: 1/(cos(2x)-sin(2x)).`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, n!polcoeff(1/(cos(2x+xO(x^n))-sin(2x+x*O(x^n))), n))`
	CROSSREFS	`Equals 2^n * A001586(n).` `Sequence in context: A055531 A059435 A143923 this_sequence A121357 A098926 A074610` `Adjacent sequences: A079855 A079856 A079857 this_sequence A079859 A079860 A079861`
	KEYWORD	`nonn,easy`
	AUTHOR	`Michael Somos, Jan 20 2003`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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