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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 (list; graph; refs; listen; history; text; internal format)
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.

LINKS

Table of n, a(n) for n=1..4.

Craig Knecht, 46 sphinx dominoes.

Craig Knecht, Sphinx domino introduction.

Craig Knecht, Sphinx domino tiling.

Craig Knecht, T12 missing one of the fundamental two dominoes.

CROSSREFS

Cf. A279887, A317541.

Sequence in context: A206460 A340890 A093937 * A178329 A062030 A052497

Adjacent sequences: A318894 A318895 A318896 * A318898 A318899 A318900

KEYWORD

nonn,more

AUTHOR

Craig Knecht, Sep 05 2018

STATUS

approved

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Last modified November 27 01:14 EST 2022. Contains 358362 sequences. (Running on oeis4.)