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A374550
Number of length n inversion sequences avoiding the patterns 120 and 201.
1
1, 1, 2, 6, 23, 102, 498, 2607, 14386, 82663, 490228, 2981407, 18507513, 116855873, 748427848, 4851982365, 31784721142, 210111119681, 1399977460914, 9393523464391, 63420812374620, 430570197000992, 2937789342516835, 20135022976572246, 138566149670814993
OFFSET
0,3
KEYWORD
nonn
AUTHOR
Benjamin Testart, Jul 17 2024
STATUS
approved