A049215 - OEIS

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A049215

Scaled coefficients of (arctanh x)^4.

1, 40, 2464, 229760, 30633856, 5561407488, 1322489954304, 399463775797248, 149519094622027776, 67960463478175825920, 36884466463352967659520, 23566236397584291201024000, 17511732541318788803985408000 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`e.g.f. (arctanh x)^4 or (1-x^2)^-1 * (arctanh x)^3` `a(n) is coefficient of x^(2n+4) in (arctanh x)^4, multiplied by (2n+4)!/4!`
	EXAMPLE	`(arctanh x)^4 = x^4 + 4/3x^6 + 22/15x^8 + 1436/945*x^10 + ...`
	CROSSREFS	`Sequence in context: A060056 A140729 A003741 * A188154 A178721 A059948` `Adjacent sequences: A049212 A049213 A049214 * A049216 A049217 A049218`
	KEYWORD	`nonn`
	AUTHOR	`Joe Keane (jgk(AT)jgk.org)`

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Last modified February 17 16:38 EST 2012. Contains 206058 sequences.