id:A154324 - OEIS Search Results

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Diagonal sums of number triangle A113582.

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1, 1, 2, 3, 6, 12, 23, 43, 74, 124, 195, 300, 441, 637, 890, 1226, 1647, 2187, 2848, 3673, 4664, 5874, 7305, 9021, 11024, 13390, 16121, 19306, 22947, 27147, 31908, 37348, 43469, 50405, 58158, 66879, 76570, 87400, 99371, 112671, 127302 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`G.f.: (1-2x-x^2+5x^3-x^4-2x^5+x^6)/((1-x)(1-x^2))^3; a(n)=sum{k=0..floor(n/2), 1+C(k+1,2)C(n-2k+1,2)}.`
	CROSSREFS	`Sequence in context: A060985 A068012 A019138 this_sequence A001630 A164363 A103341` `Adjacent sequences: A154321 A154322 A154323 this_sequence A154325 A154326 A154327`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 07 2009`

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Last modified November 24 14:25 EST 2009. Contains 167438 sequences.

AT&T Labs Research