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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 18 |
| 3 | 621 |
| 4 | 3374 |
| 5 | 15508 |
| 6 | 53568 |
| 7 | 162919 |
| 8 | 463916 |
| 9 | 1262057 |
| 10 | 3344312 |
| 11 | 8682013 |
| 12 | 22096236 |
| 13 | 55418093 |
| 14 | 137452378 |
| 15 | 337368553 |
| 16 | 820589074 |
| 17 | 1981158104 |
| 18 | 4751265748 |
| 19 | 11325996647 |
| 20 | 26856461774 |
| 21 | 63380869317 |
| 22 | 148929846348 |
| 23 | 348578197271 |
[0,18,621,3374,15508,53568,162919,463916,1262057, 3344312,8682013,22096236,55418093,137452378, 337368553,820589074,1981158104,4751265748, 11325996647,26856461774,63380869317,148929846348, 348578197271] |