id:A106466 - OEIS Search Results

Search: id:A106466

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Interleave 1,2,3,.. with 1,1,2,2,3,3,...

+0
3

1, 1, 2, 1, 3, 2, 4, 2, 5, 3, 6, 3, 7, 4, 8, 4, 9, 5, 10, 5, 11, 6, 12, 6, 13, 7, 14, 7, 15, 8, 16, 8, 17, 9, 18, 9, 19, 10, 20, 10, 21, 11, 22, 11, 23, 12, 24, 12, 25, 13, 26, 13, 27, 14, 28, 14, 29, 15, 30, 15, 31, 16, 32, 16, 33, 17, 34, 17, 35, 18, 36 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Diagonal sums of A106465.`
	FORMULA	`G.f.: (1+x+x^2)/((1+x^2)(1-x^2)^2); a(n)=a(n-2)+a(n-4)-a(n-6); a(n)=sum{k=0..floor(n/2), gcd(n-k+1, k+1) mod 2};`
	CROSSREFS	`Sequence in context: A049773 A123021 A028914 this_sequence A130722 A024162 A078658` `Adjacent sequences: A106463 A106464 A106465 this_sequence A106467 A106468 A106469`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 03 2005`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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