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Search: id:A064643
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| A064643 |
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Bidirectional 'Delannoy' variation of the Boustrophedon transform applied to all 1's sequence: Fill an triangular array in alternating directions. Let the first element of each row in that direction be equal to 1. Each next entry is given by T(n,k) = T(n,k +/- 1) + T(n-1,k-1) + T(n-1,k) + T(n-2,k-1), where the +/- depends on which is the previous element in the direction one is filling in the row. The final number of row n gives a(n). |
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| 1, 2, 6, 22, 105, 631, 4603, 39469, 388870, 4327322, 53670985, 734069672, 10975379510, 178080287645, 3116286236549, 58502460526469
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