id:A121285 - OEIS Search Results

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a(0) = 1; for n>0, a(n) = (n+3)*2^(n-2)-n*binomial(n-1, floor( (n-1)/2 ))-(n-1)*binomial(n-2,floor((n-2)/2)).

+0
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1, 1, 2, 4, 10, 22, 54, 120, 284, 626, 1438, 3136, 7044, 15212, 33596, 71952, 156856, 333610, 719886, 1522224, 3257972, 6855476, 14574772, 30541264, 64571400, 134827252, 283727564, 590608960, 1237926184, 2569953496, 5368225848, 11118205088, 23155034480, 47856472218 (list; graph; listen)

	OFFSET	`0,3`
	REFERENCES	`A. Bernini, F. Disanto, R. Pinzani and S. Rinaldi, Permutations defining convex permutominoes, preprint, 2007. [See S_{n+1}.]`
	CROSSREFS	`Sequence in context: A075560 A078040 A164990 this_sequence A030234 A148086 A076875` `Adjacent sequences: A121282 A121283 A121284 this_sequence A121286 A121287 A121288`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jul 28 2007`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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