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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 35 |
| 5 | 116 |
| 6 | 500 |
| 7 | 1862 |
| 8 | 8294 |
| 9 | 33249 |
| 10 | 151183 |
| 11 | 634813 |
| 12 | 2931946 |
| 13 | 12703620 |
| 14 | 59376538 |
| 15 | 263224140 |
| 16 | 1241544311 |
| 17 | 5601006741 |
| 18 | 26605292985 |
| 19 | 121687147307 |
| 20 | 581285094579 |
| 21 | 2688189609858 |
| 22 | 12900275303951 |
| 23 | 60197931997810 |
| 24 | 289988678907296 |
| 25 | 1363334026137031 |
| 26 | 6588771922311268 |
| 27 | 31170328189487342 |
[1,1,3,9,35,116,500,1862,8294,33249,151183,634813, 2931946,12703620,59376538,263224140,1241544311, 5601006741,26605292985,121687147307,581285094579, 2688189609858,12900275303951,60197931997810, 289988678907296,1363334026137031,6588771922311268, 31170328189487342] |