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A233343
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Number of tilings of a 7 X 3n rectangle using 7n trominoes of any shape.
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3
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1, 441, 614581, 1064557805, 1949314526229, 3619365754064658, 6743148875847013949, 12573396789552627635974, 23449283563696481324707977, 43734844458505039459034141789, 81570040233489554572733439665568, 152137050633841639720340771054558899
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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CROSSREFS
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Trisection of column k=7 of A233320.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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