id:A104880 - OEIS Search Results

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Diagonal sums of a sum-of-powers triangle.

+0
2

1, 1, 2, 3, 5, 8, 14, 26, 53, 117, 280, 721, 1989, 5844, 18188, 59652, 205305, 739041, 2775190, 10846975, 44039765, 185391480, 807776210, 3637193486, 16900721837, 80939650565, 399061251260, 2023408865997, 10540656630133, 56362743769012 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Diagonal sums of A104878.`
	FORMULA	`a(0)=1, a(1)=1, a(n)=n+sum{k=2..floor(n/2), (k^(n-2k+1)-1)/(k-1)}, n>1.`
	CROSSREFS	`Sequence in context: A119262 A062178 A065955 this_sequence A102973 A066372 A058519` `Adjacent sequences: A104877 A104878 A104879 this_sequence A104881 A104882 A104883`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 28 2005`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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