A008936 - OEIS

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A008936

Expansion of (1-2*x-x^4)/(1-2*x)^2.

1, 2, 4, 8, 15, 28, 52, 96, 176, 320, 576, 1024, 1792, 3072, 5120, 8192, 12288, 16384, 16384, 0, -65536, -262144, -786432, -2097152, -5242880, -12582912, -29360128, -67108864, -150994944, -335544320, -738197504 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	MAPLE	`A008936 := proc(n) option remember; if n <= 3 then 2^n else 2*A008936(n-1)-2^(n-4); fi; end;`
	PROG	`a(n)=2^n-2^(n-4)*max(n-3, 0)`
	CROSSREFS	`Sequence in context: A114833 A065617 A062065 * A073769 A008937 A128805` `Adjacent sequences: A008933 A008934 A008935 * A008937 A008938 A008939`
	KEYWORD	`sign`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Alejandro Teruel (teruel(AT)usb.ve)`
	EXTENSIONS	`Better description from Michael Somos, Jan 12 2000.`

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Last modified February 17 16:49 EST 2012. Contains 206058 sequences.