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A276688 a(n) = Im([n]_{1+i}!), where [n]_q! is the q-factorial, i = sqrt(-1). 4
0, 0, 1, 8, 5, -220, 1895, -9140, -302175, -2778300, -95631825, -10071428100, -236788407375, 57706241794500, -7412904844112625, 525300693117661500, 348922898045520800625, 55166584329677385922500, 28368558145043150339199375, 46873210124734003815040957500 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
LINKS
Eric Weisstein's World of Mathematics, q-Factorial.
MAPLE
a:= n-> Im(mul(((1+I)^j-1)/((1+I)-1), j=1..n)):
seq(a(n), n=0..20); # Alois P. Heinz, Sep 14 2016
MATHEMATICA
Im@Table[QFactorial[n, 1 + I], {n, 0, 20}]
CROSSREFS
Cf. A275706 (real part), A005329.
Sequence in context: A106287 A361711 A239862 * A010117 A010119 A010116
KEYWORD
sign
AUTHOR
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)