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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 70 |
| 5 | 363 |
| 6 | 1925 |
| 7 | 10364 |
| 8 | 56412 |
| 9 | 309605 |
| 10 | 1710247 |
| 11 | 9496746 |
| 12 | 52960674 |
| 13 | 296408847 |
| 14 | 1663998345 |
| 15 | 9365980152 |
| 16 | 52837614456 |
| 17 | 298676661129 |
| 18 | 1691325089867 |
| 19 | 9592607927750 |
| 20 | 54482777049918 |
| 21 | 309837754937843 |
| 22 | 1764046900535053 |
| 23 | 10054065679046004 |
| 24 | 57357471874390100 |
[0,1,3,14,70,363,1925,10364,56412,309605,1710247, 9496746,52960674,296408847,1663998345,9365980152, 52837614456,298676661129,1691325089867, 9592607927750,54482777049918,309837754937843, 1764046900535053,10054065679046004, 57357471874390100] |