A129653 - OEIS

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A129653

Diagonal sums of number triangle A129652.

1, 1, 4, 15, 83, 556, 4435, 40773, 423836, 4908403, 62606297, 871421976, 13136605577, 213122669141, 3701085673676, 68480774296803, 1344611320542931, 27917413103561540, 611000785570868627, 14056645627856206809 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), ((n-k)!/k!)*sum{i=0..n-2k, C(n-2k-1,i)/(n-2k-i)!}`
	CROSSREFS	`Sequence in context: A174661 A207161 A203121 * A081722 A117927 A143340` `Adjacent sequences: A129650 A129651 A129652 * A129654 A129655 A129656`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 26 2007`

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Last modified February 17 13:28 EST 2012. Contains 206031 sequences.