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A051637
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Chromos with n colors.
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0
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OFFSET
| 2,2
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REFERENCES
| T. W. Cusick, P. Stanica, Counting the n-chromos of I.J. Schoenberg, Journal of Combinatorial Theory, Ser. A, Vol. 79, No. 2, pp. 298-314.
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LINKS
| P. Stanica, Chromos and covering residue classes, preprint, Dec., 1999.
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EXAMPLE
| a(2)=1 because 12 is the only chromo with two colors, a(3)=2 because 123 and 122133 are the only chromos with three colors.
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CROSSREFS
| Sequence in context: A109800 A152136 A059180 * A051471 A047531 A102808
Adjacent sequences: A051634 A051635 A051636 * A051638 A051639 A051640
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KEYWORD
| hard,nice,nonn
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AUTHOR
| Pantelimon Stanica (pstanica(AT)mail.aum.edu)
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EXTENSIONS
| Next term is >=27.
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