A013007 - OEIS

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A013007

sec(arctan(x)+tan(x))=1+4/2!*x^2+80/4!*x^4+4384/6!*x^6+436992/8!*x^8...

1, 4, 80, 4384, 436992, 70425984, 16592126976, 5395435991040, 2312302178205696, 1263775007737085952, 857643638399523454976, 707659940568946007474176, 697634806106676807565574144 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A013090 A012042 A013139 * A013008 A013180 A000316` `Adjacent sequences: A013004 A013005 A013006 * A013008 A013009 A013010`
	KEYWORD	`nonn`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 15 12:14 EST 2012. Contains 205783 sequences.