A123491 - OEIS

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A123491

Diagonal sums of number triangle A123490.

1, 2, 5, 10, 22, 48, 112, 274, 715, 1982, 5837, 18180, 59644, 205296, 739032, 2775180, 10846965, 44039754, 185391469, 807776198, 3637193474, 16900721824, 80939650552, 399061251246, 2023408865983, 10540656630118 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n)=sum{k=0..floor(n/2), ((k+2)^(n-2k)+k)/(k+1)}`
	CROSSREFS	`Sequence in context: A144520 A101399 A018109 * A166300 A038149 A046745` `Adjacent sequences: A123488 A123489 A123490 * A123492 A123493 A123494`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Oct 01 2006`

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Last modified February 14 19:37 EST 2012. Contains 205663 sequences.