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A318897
Number of tilings of the even-order sphinx with the two dominoes that form the second-order sphinx.
2
1, 8, 5433, 28925040
OFFSET
1,2
COMMENTS
There are 46 sphinx dominoes. The order 2 sphinx is composed of two different dominoes. These two dominoes are used to tile the even-order sphinx.
The orientation of the order 8 sphinx in the link below is essential for the bit-vector bottom-up search to efficiently find solutions. All order 8 solutions are found in a few minutes.
CROSSREFS
Sequence in context: A206460 A340890 A093937 * A178329 A062030 A052497
KEYWORD
nonn,more
AUTHOR
Craig Knecht, Sep 05 2018
STATUS
approved