id:A027561 - OEIS Search Results

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Number of 4-unbalanced strings of length n (=2^n-A027559[ n ]).

+0
1

0, 0, 0, 0, 0, 2, 6, 22, 56, 152, 356, 858, 1914, 4334, 9372, 20440, 43280, 92114, 192182, 402246, 830328, 1717496, 3517668, 7214218, 14689994, 29938526, 60697148, 123127224, 248807472, 502963778, 1013829414, 2044098166 (list; graph; listen)

	OFFSET	`0,6`
	FORMULA	`For n>0, a(n) = 2Fibonacci(n+3) + 2^n + [5(-1)^n - 19]3^[n/2-1]. - R. Stephan, May 13 2004`
	CROSSREFS	`Sequence in context: A085286 A062085 A147800 this_sequence A126171 A002839 A109194` `Adjacent sequences: A027558 A027559 A027560 this_sequence A027562 A027563 A027564`
	KEYWORD	`nonn`
	AUTHOR	`R. K. Guy (rkg(AT)cpsc.ucalgary.ca), callan(AT)bayes.stat.wisc.edu (David Callan)`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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