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A103293
Number of ways to color n regions arranged in a line such that consecutive regions do not have the same color.
+0
2
1, 1, 1, 2, 4, 11, 32, 117, 468, 2152, 10743, 58487, 340390, 2110219, 13830235, 95475556, 691543094, 5240285139, 41432986588, 341040317063, 2916376237350, 25862097486758, 237434959191057, 2253358057283035
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Maintained by
N. J. A. Sloane
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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