id:A102568 - OEIS Search Results

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a(n+1) = if a(n-1)=a(n)-1 then 2*a(n) else smallest number not occurring earlier; a(1)=1, a(2)=2.

+0
4

1, 2, 4, 3, 5, 6, 12, 7, 8, 16, 9, 10, 20, 11, 13, 14, 28, 15, 17, 18, 36, 19, 21, 22, 44, 23, 24, 48, 25, 26, 52, 27, 29, 30, 60, 31, 32, 64, 33, 34, 68, 35, 37, 38, 76, 39, 40, 80, 41, 42, 84, 43, 45, 46, 92, 47, 49, 50, 100, 51, 53, 54, 108, 55, 56, 112, 57, 58, 116, 59, 61 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Permutation of the natural numbers with inverse A102569;` `a(n) <= 2*n; a(n) <> n for n>6;` `A102570(n) = a(a(n)).`
	LINKS	`Index entries for sequences that are permutations of the natural numbers`
	CROSSREFS	`Sequence in context: A132949 A086434 A086433 this_sequence A102767 A166266 A011295` `Adjacent sequences: A102565 A102566 A102567 this_sequence A102569 A102570 A102571`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 15 2005`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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