id:A105871 - OEIS Search Results

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Diagonal sums of number triangle A105870.

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1, 2, 6, 22, 85, 336, 1350, 5492, 22554, 93300, 388201, 1622868, 6811056, 28680356, 121111440, 512684484, 2174928031, 9243973062, 39354962345, 167799259130, 716414975613, 3062437147352, 13105366936465, 56139506687280 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=sum{k=0..floor(n/2), C(2n-3k, n)C(n-k, k)}`
	CROSSREFS	`Sequence in context: A055700 A150247 A150248 this_sequence A150249 A150250 A150251` `Adjacent sequences: A105868 A105869 A105870 this_sequence A105872 A105873 A105874`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 23 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research