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Search: id:A049215
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| A049215 |
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Scaled coefficients of (arctanh x)^4. |
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+0
2
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| 1, 40, 2464, 229760, 30633856, 5561407488, 1322489954304, 399463775797248, 149519094622027776, 67960463478175825920, 36884466463352967659520, 23566236397584291201024000, 17511732541318788803985408000
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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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!
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EXAMPLE
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(arctanh x)^4 = x^4 + 4/3*x^6 + 22/15*x^8 + 1436/945*x^10 + ...
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CROSSREFS
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Sequence in context: A060056 A140729 A003741 this_sequence A059948 A045502 A123810
Adjacent sequences: A049212 A049213 A049214 this_sequence A049216 A049217 A049218
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KEYWORD
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nonn
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AUTHOR
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Joe Keane (jgk(AT)jgk.org)
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