id:A002248 - OEIS Search Results

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Number of points on y^2+xy=x^3+x^2+x over GF(2^n).

+0
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2, 8, 14, 16, 22, 56, 142, 288, 518, 968, 1982, 4144, 8374, 16472, 32494, 65088, 131174, 263144, 525086, 1047376, 2094358, 4193912, 8393806, 16783200, 33550022, 67092488, 134210174, 268460656, 536911222 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n) = 2^n + 1 - b(n), b(n)=b(n-1)-2*b(n-2), b(1)=1, b(2)=-3.` `G.f.: [2-4x^2]/[(1-x)(1-2x)(1-x+2x^2)].`
	CROSSREFS	`Sequence in context: A106359 A077241 A066567 this_sequence A050619 A056715 A105610` `Adjacent sequences: A002245 A002246 A002247 this_sequence A002249 A002250 A002251`
	KEYWORD	`nonn`
	AUTHOR	`njas, Iwan Duursma (duursma(AT)research.att.com)`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

AT&T Labs Research