id:A080412 - OEIS Search Results

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Exchange rightmost two binary digits of n>1; a(0)=0, a(1)=2.

+0
5

0, 2, 1, 3, 4, 6, 5, 7, 8, 10, 9, 11, 12, 14, 13, 15, 16, 18, 17, 19, 20, 22, 21, 23, 24, 26, 25, 27, 28, 30, 29, 31, 32, 34, 33, 35, 36, 38, 37, 39, 40, 42, 41, 43, 44, 46, 45, 47, 48, 50, 49, 51, 52, 54, 53, 55, 56, 58, 57, 59, 60, 62, 61, 63, 64, 66, 65, 67, 68, 70, 69, 71, 72 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`For n>3: a(n) = 4*floor(n/4) + a(n mod 4); self-inverse permutation of natural numbers: a(a(n))=n.`
	LINKS	`Index entries for sequences that are permutations of the natural numbers`
	EXAMPLE	`a(20)=a('101'00')='101'00'=20; a(21)=a('101'01')='101'10'=22.` `a(2)=a('10')='01'=2; a(3)=a('11')='11'=3;`
	CROSSREFS	`Cf. A007088, A004442, A080413, A080414.` `Sequence in context: A122512 A122514 A130077 this_sequence A098164 A060214 A030133` `Adjacent sequences: A080409 A080410 A080411 this_sequence A080413 A080414 A080415`
	KEYWORD	`nonn,nice`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 17 2003`

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Last modified September 5 23:51 EDT 2008. Contains 143485 sequences.

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