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A276688
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a(n) = Im([n]_{1+i}!), where [n]_q! is the q-factorial, i = sqrt(-1).
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4
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0, 0, 1, 8, 5, -220, 1895, -9140, -302175, -2778300, -95631825, -10071428100, -236788407375, 57706241794500, -7412904844112625, 525300693117661500, 348922898045520800625, 55166584329677385922500, 28368558145043150339199375, 46873210124734003815040957500
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OFFSET
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0,4
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LINKS
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MAPLE
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a:= n-> Im(mul(((1+I)^j-1)/((1+I)-1), j=1..n)):
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MATHEMATICA
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Im@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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