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A200000 Number of meanders filling
out an n-by-n grid, reduced for symmetry.
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x1
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x2
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x4
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x8
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A200000
x1+x2+x4+x8 |
A200749
x1+2*x2+4*x4+8*x8
| | n=1 | 1 | 0 | 0 | 0 | 1 | 1
| | 2 | 1 | 0 | 0 | 0 | 1 | 1
| | 3 | 0 | 0 | 0 | 0 | 0 | 0
| | 4 | 1 | 1 | 2 | 0 | 4 | 11
| | 5 | 0 | 0 | 4 | 38 | 42 | 320
| | 6 | 0 | 12 | 170 | 8868 | 9050 | 71648
| | 7 | ? | ? | ? | ? | 6965359 | 55717584
| | 8 | 1 | 299 | 206305 | 26721645856 | 26721852461 | 213773992667
| | 9 | ? | ? | ? | ? | ? | 3437213982024260
| | 10 | 2 | 33544 | 3858758949 | 31194475937966096274 | 31194475941824888769 | 249555807519163873078
| | 11 | | | | | |
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