id:A051041 - OEIS Search Results

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Number of square-free quaternary words of length n.

+0
2

4, 12, 36, 96, 264, 696, 1848, 4848, 12768, 33480, 87936, 230520, 604608, 1585128, 4156392, 10895952, 28566216, 74887056, 196322976, 514662960, 1349208600, 3536962584, 9272217936, 24307198464, 63721617888 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	CROSSREFS	`Cf. A006156.` `Sequence in context: A020875 A063810 A002842 this_sequence A002906 A001411 A095350` `Adjacent sequences: A051038 A051039 A051040 this_sequence A051042 A051043 A051044`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com)`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 27 2002` `a(13)-a(15) from John W. Layman (layman(AT)math.vt.edu), Mar 03 2004` `a(16)-a(25) from Max Alekseyev (maxale(AT)gmail.com), Jul 03 2006`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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