id:A128131 - OEIS Search Results

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a(n)=Im{sum{k=0..n, (2i)^(n-k+1)}}, i=sqrt(-1);.

+0
1

1, -4, 0, 0, -16384, 1048576, 0, 0, 17592186044416, -18014398509481984, 0, 0, -1237940039285380274899124224, 20282409603651670423947251286016, 0, 0, 5708990770823839524233143877797980545530986496 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=2^n2^C(n+1,2)A128130(n);`
	CROSSREFS	`Cf. A036442, A127945.` `Sequence in context: A013451 A013462 A101453 this_sequence A115713 A115633 A036859` `Adjacent sequences: A128128 A128129 A128130 this_sequence A128132 A128133 A128134`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 15 2007`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

AT&T Labs Research