id:A057555 - OEIS Search Results

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Lexicographic ordering of {1,2,3...}^2.

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1, 1, 1, 2, 2, 1, 1, 3, 2, 2, 3, 1, 1, 4, 2, 3, 3, 2, 4, 1, 1, 5, 2, 4, 3, 3, 4, 2, 5, 1, 1, 6, 2, 5, 3, 4, 4, 3, 5, 2, 6, 1, 1, 7, 2, 6, 3, 5, 4, 4, 5, 3, 6, 2, 7, 1, 1, 8, 2, 7, 3, 6, 4, 5, 5, 4, 6, 3, 7, 2, 8, 1, 1, 9, 2, 8, 3, 7, 4, 6, 5, 5, 6, 4, 7, 3, 8, 2, 9, 1, 1, 10, 2, 9, 3, 8, 4, 7, 5, 6, 6, 5, 7, 4 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`a(2n)=A004736(n), a(2n+1)=A002260(n). - Michael Somos Mar 06 2004`
	EXAMPLE	`Ordered lattice points: (1,1)<(1,2)<(2,1)<(1,3)<(2,2)<...`
	PROGRAM	`(PARI) a(n)=if(n<1, 0, 1+(-1)^(n%2)(binomial((n+1)%2+(sqrtint(4n)+1)\2, 2)-n\2)) - Michael Somos Mar 06 2004`
	CROSSREFS	`Adjacent sequences: A057552 A057553 A057554 this_sequence A057556 A057557 A057558` `Sequence in context: A117545 A047000 A139767 this_sequence A075532 A050176 A047130`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu), Sep 07 2000`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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