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A259213
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Column 2 of triangle A258829.
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2
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1, 2, 11, 38, 263, 1260, 10871, 66576, 694599, 5182960, 63738259, 561098224, 7969169739, 80865956192, 1304923903919, 14998292190464, 271341955926479, 3484403002454016, 69899466563099435, 991886288235459072, 21861082423955691795, 339715268249655012352
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) ~ n! * (d*(1-(-1)^n) + 1+(-1)^n)*c/2 * d^n * n^2, where d = 0.8218983778054251105765881248... = 1/(r*sqrt(2)), where r is the root of the equation cot(r)=r and c = 0.986093542875063325007949... . - Vaclav Kotesovec, Jun 21 2015, updated Mar 16 2024
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CROSSREFS
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KEYWORD
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nonn,changed
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AUTHOR
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STATUS
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approved
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