A013151 - OEIS

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A013151

sech(tanh(x)+arctan(x))=1-4/2!*x^2+112/4!*x^4-7744/6!*x^6...

1, -4, 112, -7744, 995840, -205558144, 62203595776, -25948859891712, 14273513699311616, -10010170584339742720, 8717845696617764192256, -9230668213290446763196416, 11677592409577212192402440192 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A135917 A158450 A063406 * A006718 A185320 A196458` `Adjacent sequences: A013148 A013149 A013150 * A013152 A013153 A013154`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 14 08:32 EST 2012. Contains 205614 sequences.