id:A093357 - OEIS Search Results

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Number of occurrences of pattern 2-1 after n iterations of morphism A007413.

+0
1

0, 4, 20, 88, 368, 1504, 6080, 24448, 98048, 392704, 1571840, 6289408, 25161728, 100655104, 402636800, 1610579968, 6442385408, 25769672704, 103078952960, 412316336128, 1649266393088, 6597067669504, 26388274872320 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`S. Kitaev and T. Mansour, Counting the occurrences of generalized patterns....`
	FORMULA	`a(1) = 0, a(n) = {3*4^(n-1) - 2^n}/2.` `G.f.: [4x-4x^2]/[(1-2x)(1-4x)].`
	PROGRAM	`(PARI) a(n)=if(n==1, 0, (3*4^(n-1)-2^n)/2)`
	CROSSREFS	`Sequence in context: A084240 A080674 A110154 this_sequence A027156 A017964 A017965` `Adjacent sequences: A093354 A093355 A093356 this_sequence A093358 A093359 A093360`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Apr 27 2004`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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