id:A032122 - OEIS Search Results

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Number of reversible strings with n beads of 5 colors.

+0
5

5, 15, 75, 325, 1625, 7875, 39375, 195625, 978125, 4884375, 24421875, 122078125, 610390625, 3051796875, 15258984375, 76294140625, 381470703125, 1907349609375, 9536748046875, 47683720703125 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`C. G. Bower, Transforms (2)`
	FORMULA	`"BIK" (reversible, indistinct, unlabeled) transform of 5, 0, 0, 0...` `a(n) = 1/2 * (5^n + 5^[(n+1)/2]) = 5*A001447(n+1). - Ralf Stephan (ralf(AT)ark.in-berlin.de), Jul 07 2003`
	CROSSREFS	`Sequence in context: A066886 A079569 A101553 this_sequence A064678 A088935 A030487` `Adjacent sequences: A032119 A032120 A032121 this_sequence A032123 A032124 A032125`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net)`

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Last modified September 8 08:06 EDT 2008. Contains 143486 sequences.

AT&T Labs Research