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Search: id:A151347
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| A151347 |
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Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (0, 1), (1, -1)} |
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+0
1
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| 1, 0, 1, 1, 3, 8, 19, 65, 177, 611, 1928, 6648, 22928, 80851, 292343, 1063611, 3957406, 14818681, 56339994, 215943994, 836246604, 3265240671, 12848804154, 50936668789, 203235590343, 816070826188, 3295317218038, 13379003847708, 54588942258042, 223782828113783, 921414594957514, 3809576782931810
(list; graph; listen)
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