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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 66 |
| 3 | 372 |
| 4 | 1930 |
| 5 | 9516 |
| 6 | 45332 |
| 7 | 210664 |
| 8 | 960858 |
| 9 | 4319100 |
| 10 | 19188796 |
| 11 | 84438360 |
| 12 | 368603716 |
| 13 | 1598231992 |
| 14 | 6889682280 |
| 15 | 29551095248 |
| 16 | 126193235194 |
| 17 | 536799072924 |
| 18 | 2275560109868 |
| 19 | 9616650989560 |
| 20 | 40527780684972 |
| 21 | 170368957887656 |
| 22 | 714556104675736 |
| 23 | 2990728476330672 |
[1,10,66,372,1930,9516,45332,210664,960858, 4319100,19188796,84438360,368603716,1598231992, 6889682280,29551095248,126193235194,536799072924, 2275560109868,9616650989560,40527780684972, 170368957887656,714556104675736,2990728476330672] |