A024252 - OEIS

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A024252

Expansion of tan(x)*tan(tanh(x))/2.

0, 1, 4, 24, 1088, 36352, 1283584, 160269312, 11824283648, 1434982481920, 275376204414976, 40808962274623488, 10384927347565395968, 2724691062936548933632, 799682075020079191293952 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Table of n, a(n) for n=0..14.`
	MATHEMATICA	`Tan[ x ]Tan[ Tanh[ x ] ]/2 ( Even Part *)`
	CROSSREFS	`A009751.` `Sequence in context: A009043 A024251 A193484 * A303131 A012124 A108185` `Adjacent sequences: A024249 A024250 A024251 * A024253 A024254 A024255`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin`
	EXTENSIONS	`Extended and signs tested 03/97.`
	STATUS	`approved`

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)