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A051041
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
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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