id:A089264 - OEIS Search Results

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Number of permutations of length n containing exactly once 132 and 213, likewise for pattern pair (231,312).

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2

3, 6, 17, 42, 102, 242, 564, 1296, 2944, 6624, 14784, 32768, 72192, 158208, 345088, 749568, 1622016, 3497984, 7520256, 16121856, 34471936, 73531392, 156499968, 332398592, 704643072, 1491075072, 3149922304, 6643777536, 13992198144 (list; graph; listen)

	OFFSET	`4,1`
	LINKS	`A. Robertson, Permutations restricted by two distinct patterns of length three`
	FORMULA	`For n>=7, (n^2+21n-28)2^(n-9).`
	CROSSREFS	`Cf. A001815.` `Adjacent sequences: A089261 A089262 A089263 this_sequence A089265 A089266 A089267` `Sequence in context: A049943 A027415 A007718 this_sequence A121399 A129905 A143363`
	KEYWORD	`nonn,easy`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 30 2003`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

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