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A093346 Array read by antidiagonals: T(r,n) = number of two-stack sortable r-permutations. +0
1
1, 1, 2, 1, 3, 6, 1, 4, 15, 22, 1, 5, 28, 95, 91, 1, 6, 45, 252, 690, 408, 1, 7, 66, 525, 2618, 5481, 1938, 1, 8, 91, 946, 7095, 29848, 46376, 9614, 1, 9, 120, 1547, 15741, 105417, 363216, 411255, 49335, 1, 10, 153, 2360, 30576, 288288, 1673535 (list; table; graph; listen)
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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