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A123491 Diagonal sums of number triangle A123490. 1
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.