id:A107031 - OEIS Search Results

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Diagonal sums of number triangle A107030.

+0
2

1, 2, 3, 4, 7, 12, 25, 56, 145, 422, 1389, 5072, 20283, 87996, 412663, 2087868, 11361831, 66155642, 409567833, 2680486870, 18465061963, 133504614880, 1011121118741, 8008145020804, 66201411633209, 570006877641976 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=sum{k=0..floor(n/2), (k-1)C(k(n-2k), n-2k)-(k-2)sum{j=0..n-k, C(k(n-2k), j)}}`
	CROSSREFS	`Adjacent sequences: A107028 A107029 A107030 this_sequence A107032 A107033 A107034` `Sequence in context: A103963 A006706 A124390 this_sequence A023162 A022437 A057983`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 09 2005`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

AT&T Labs Research