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Search: id:A108767
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| A108767 |
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Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(1,1), d=(1,-2) and have k peaks (i.e. ud's). |
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4
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| 1, 1, 2, 1, 6, 5, 1, 12, 28, 14, 1, 20, 90, 120, 42, 1, 30, 220, 550, 495, 132, 1, 42, 455, 1820, 3003, 2002, 429, 1, 56, 840, 4900, 12740, 15288, 8008, 1430, 1, 72, 1428, 11424, 42840, 79968, 74256, 31824, 4862, 1, 90, 2280, 23940, 122094, 325584, 465120
(list; table; graph; listen)
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