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A275706
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a(n) = Re([n]_{1+i}!), where [n]_q! is the q-factorial, i = sqrt(-1).
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5
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1, 1, 2, 1, -40, 135, -860, 20145, -137100, -6726225, -212460900, -3642898575, 654642826500, -26505894416625, 3335048243533500, -1368325090374591375, 133951676745003682500, 123266968248328746879375, 63057521158814641016317500, 17732380504905960076345280625
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OFFSET
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0,3
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LINKS
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MAPLE
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a:= n-> Re(mul(((1+I)^j-1)/((1+I)-1), j=1..n)):
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MATHEMATICA
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Re@Table[QFactorial[n, 1 + I], {n, 0, 20}]
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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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