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A112307 Triangle read by rows: T(n,k) is number of Dyck paths of semilength n with height of second peak equal to k (n>=1; 0<=k<=n-1). +0
2
1, 1, 1, 1, 2, 2, 1, 4, 6, 3, 1, 9, 16, 12, 4, 1, 23, 44, 39, 20, 5, 1, 65, 128, 123, 76, 30, 6, 1, 197, 392, 393, 268, 130, 42, 7, 1, 626, 1250, 1284, 928, 505, 204, 56, 8, 1, 2056, 4110, 4287, 3216, 1880, 864, 301, 72, 9, 1, 6918, 13834, 14583, 11224, 6885, 3438, 1379 (list; table; graph; listen)
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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