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Search: id:A110440
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| A110440 |
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Triangular array formed by the little Schroeder numbers. s(n,k)= the number of unit step restricted paths (i.e. they never go below the x-axis) from the origin (0,0) to (n-1,k-1) using up step U(1,1), three types of level steps L(1,0),L'(1,0),L"(1,0) and two types of down steps D(1,-1),D'(1,-1). s(0,0)=1 and the leftmost column s(n,0) is A001003. |
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| 1, 3, 1, 11, 6, 1, 45, 31, 9, 1, 197, 156, 60, 12, 1, 903, 785, 360, 98, 15, 1, 4279, 3978, 2061, 684, 145, 18, 1, 20793, 20335, 11529, 4403, 1155, 201, 21, 1, 103049, 104856, 63728, 27048, 8270, 1800, 266, 24, 1, 518859, 545073, 350136, 161412, 55458, 14202
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