id:A102561 - OEIS Search Results

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2^floor(n/2)((-1)^floor(n/2)+(-1)^n)/2.

+0
2

1, 0, 0, -2, 4, 0, 0, -8, 16, 0, 0, -32, 64, 0, 0, -128, 256, 0, 0, -512, 1024, 0, 0, -2048, 4096, 0, 0, -8192, 16384, 0, 0, -32768, 65536, 0, 0, -131072, 262144, 0, 0, -524288, 1048576, 0, 0, -2097152, 4194304, 0, 0, -8388608, 16777216, 0, 0, -33554432, 67108864, 0, 0, -134217728 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`a(n)=((-2)^floor(n/2)+(-1)^n2^floor(n/2))/2; a(n)=A102560*2^floor(n/2).`
	CROSSREFS	`Adjacent sequences: A102558 A102559 A102560 this_sequence A102562 A102563 A102564` `Sequence in context: A028586 A072069 A004025 this_sequence A072068 A078145 A074078`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 14 2005`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.

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