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Search: id:A151408
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| A151408 |
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Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 0), (0, 1), (1, -1), (1, 0)} |
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+0
1
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| 1, 1, 2, 5, 12, 34, 97, 287, 887, 2761, 8833, 28635, 93897, 312257, 1046368, 3539825, 12066283, 41387197, 142887038, 495828190, 1729130445, 6057385620, 21303526484, 75209346309, 266413953357, 946691896721, 3373935569795, 12056675023892, 43193395482458, 155104308523072, 558187652361721, 2012940278579932
(list; graph; listen)
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