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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 36 |
| 4 | 161 |
| 5 | 636 |
| 6 | 2507 |
| 7 | 10213 |
| 8 | 42182 |
| 9 | 173606 |
| 10 | 710976 |
| 11 | 2908797 |
| 12 | 11911516 |
| 13 | 48807427 |
| 14 | 199987737 |
| 15 | 819315100 |
| 16 | 3356387171 |
| 17 | 13749952752 |
| 18 | 56330082115 |
| 19 | 230771042950 |
| 20 | 945410224602 |
| 21 | 3873094298871 |
| 22 | 15867039092263 |
| 23 | 65003096433432 |
[1,6,36,161,636,2507,10213,42182,173606,710976, 2908797,11911516,48807427,199987737,819315100, 3356387171,13749952752,56330082115,230771042950, 945410224602,3873094298871,15867039092263, 65003096433432] |