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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 28 |
| 5 | 89 |
| 6 | 421 |
| 7 | 1898 |
| 8 | 7912 |
| 9 | 36412 |
| 10 | 169960 |
| 11 | 779139 |
| 12 | 3668210 |
| 13 | 17486938 |
| 14 | 83333003 |
| 15 | 400956919 |
| 16 | 1943928504 |
| 17 | 9455346485 |
| 18 | 46225027071 |
| 19 | 227066384875 |
| 20 | 1119123274755 |
| 21 | 5534782142253 |
| 22 | 27463607765186 |
| 23 | 136652474592260 |
| 24 | 681728348606011 |
| 25 | 3409395265172439 |
| 26 | 17088672210734316 |
[1,1,1,7,28,89,421,1898,7912,36412,169960,779139, 3668210,17486938,83333003,400956919,1943928504, 9455346485,46225027071,227066384875,1119123274755, 5534782142253,27463607765186,136652474592260, 681728348606011,3409395265172439, 17088672210734316] |