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Search: id:A133129
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| A133129 |
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Number of black/white colorings of a 3 X n rectangle which have no monochromatic 2 by 2 subsquares. |
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+0
2
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| 8, 50, 322, 2066, 13262, 85126, 546410, 3507314, 22512862, 144506294
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(2) = 50 because if the middle row is not monochromatic, the top and bottom rows are unconstrained, contributing 2*4*4. if the middle row is monochromatic, the top and bottom rows can each take on only 3 values contributing 2*3*3.
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CROSSREFS
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Cf. A055099.
Sequence in context: A127745 A037547 A061801 this_sequence A103458 A100310 A124963
Adjacent sequences: A133126 A133127 A133128 this_sequence A133130 A133131 A133132
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KEYWORD
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nonn
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AUTHOR
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Victor S. Miller (victor(AT)idaccr.org), Sep 19 2007
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