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 A049215 Scaled coefficients of (arctanh x)^4. 1
 1, 40, 2464, 229760, 30633856, 5561407488, 1322489954304, 399463775797248, 149519094622027776, 67960463478175825920, 36884466463352967659520, 23566236397584291201024000, 17511732541318788803985408000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA e.g.f. (arctanh x)^4 or (1-x^2)^-1 * (arctanh x)^3 a(n) is coefficient of x^(2*n+4) in (arctanh x)^4, multiplied by (2*n+4)!/4! EXAMPLE (arctanh x)^4 = x^4 + 4/3*x^6 + 22/15*x^8 + 1436/945*x^10 + ... CROSSREFS Sequence in context: A140729 A003741 A263553 * A221658 A188154 A268151 Adjacent sequences:  A049212 A049213 A049214 * A049216 A049217 A049218 KEYWORD nonn AUTHOR Joe Keane (jgk(AT)jgk.org) STATUS approved

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Last modified November 21 11:01 EST 2018. Contains 317447 sequences. (Running on oeis4.)