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A275706
a(n) = Re([n]_{1+i}!), where [n]_q! is the q-factorial, i = sqrt(-1).
5
1, 1, 2, 1, -40, 135, -860, 20145, -137100, -6726225, -212460900, -3642898575, 654642826500, -26505894416625, 3335048243533500, -1368325090374591375, 133951676745003682500, 123266968248328746879375, 63057521158814641016317500, 17732380504905960076345280625
OFFSET
0,3
LINKS
Eric Weisstein's World of Mathematics, q-Factorial.
MAPLE
a:= n-> Re(mul(((1+I)^j-1)/((1+I)-1), j=1..n)):
seq(a(n), n=0..20); # Alois P. Heinz, Sep 14 2016
MATHEMATICA
Re@Table[QFactorial[n, 1 + I], {n, 0, 20}]
CROSSREFS
Cf. A276688 (imaginary part), A005329.
Sequence in context: A127609 A228860 A271204 * A308749 A260884 A214221
KEYWORD
sign
AUTHOR
STATUS
approved