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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 7 |
| 5 | 42 |
| 6 | 147 |
| 7 | 176 |
| 8 | 3536 |
| 9 | 5866 |
| 10 | 8099 |
| 11 | 38939 |
| 12 | 41788 |
| 13 | 822951 |
| 14 | 2971632 |
| 15 | 6665500 |
| 16 | 240068069 |
| 17 | 516948648 |
| 18 | 8535635266 |
| 19 | 21058720638 |
| 20 | 46951859987 |
| 21 | 68385598797 |
| 22 | 2163439258745 |
| 23 | 9390234327817 |
| 24 | 72848531289280 |
[0,1,5,7,42,147,176,3536,5866,8099,38939,41788, 822951,2971632,6665500,240068069,516948648, 8535635266,21058720638,46951859987,68385598797, 2163439258745,9390234327817,72848531289280] |