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A364427
Number of order-7 ribbon tilings for a 7 X n strip.
1
1, 2, 6, 24, 120, 720, 5040, 20160, 84000, 364560, 1647744, 7754096, 37979164, 193530835, 883966084, 4052227976, 18669720090, 86583455766, 404839016404, 1911530739407, 9128783608512, 42592562625348, 198716275311992, 927456995916412
OFFSET
1,2
COMMENTS
a(n) is the number of order-7 ribbon tilings of a 7 X n strip. Note that the width of the strip is equal to the order of ribbon tiles.
REFERENCES
Yinsong Chen and Vladislav Kargin, The Number of ribbon tilings for strips, Discrete Applied Mathematics, Volume 340, 15 December 2023, pages 85-103.
LINKS
Yinsong Chen and Vladislav Kargin, The Number of Ribbon Tilings for Strips, arXiv:2307.00767 [math.CO], 2023.
CROSSREFS
Sequence in context: A319547 A319208 A276841 * A273694 A138113 A045977
KEYWORD
nonn
AUTHOR
Yinsong Chen, Aug 14 2023
STATUS
approved