id:A120110 - OEIS Search Results

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A120110

Diagonal sums of number triangle A120108.

+0
2

1, 2, 7, 15, 67, 92, 461, 1065, 3016, 3956, 29478, 42231, 379107, 547556, 603421, 991923, 12709228, 18540622, 241033695, 352271227, 389226278, 407797820, 5532937710, 8097345425, 30368363481, 41503874738, 98701094676, 127342427241 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=sum{k=0..floor(n/2), lcm(1,..,n-k+1)/lcm(1,..,k+1)}`
	CROSSREFS	`Sequence in context: A093652 A096690 A050612 this_sequence A047694 A129666 A135781` `Adjacent sequences: A120107 A120108 A120109 this_sequence A120111 A120112 A120113`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jun 09 2006`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

AT&T Labs Research