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A128131
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a(n)=Im{sum{k=0..n, (2i)^(n-k+1)}}, i=sqrt(-1);.
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0
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1, -4, 0, 0, -16384, 1048576, 0, 0, 17592186044416, -18014398509481984, 0, 0, -1237940039285380274899124224, 20282409603651670423947251286016, 0, 0, 5708990770823839524233143877797980545530986496
(list; graph; refs; listen; history; internal format)
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