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A304980
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a(n) = 4^n * (1 - 4^n) * Bernoulli(2*n) / (2*n) + EulerE(2*n).
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0
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-2, 7, -77, 1657, -58457, 3056557, -221729237, 21295269457, -2614745018417, 399460073350357, -74300372446261997, 16529958050063939257, -4333993989483331875977, 1322511243007573825356157, -464663077436832702395156357, 186233354336664458732835601057
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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Array[4^#*(1 - 4^#) BernoulliB[2 #]/(2 #) + EulerE[2 #] &, 16] (* Michael De Vlieger, May 24 2018 *)
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PROG
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(PARI) a(n) = 4^n * (1 - 4^n) * bernfrac(2*n) / (2*n) + 2*imag(polylog(-2*n, I)); \\ Michel Marcus, May 30 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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