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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 29 |
| 5 | 157 |
| 6 | 1144 |
| 7 | 10187 |
| 8 | 105600 |
| 9 | 1241794 |
| 10 | 16287457 |
| 11 | 235308853 |
| 12 | 3708090433 |
| 13 | 63234233743 |
| 14 | 1159318599835 |
| 15 | 22725352050303 |
| 16 | 474059968069223 |
| 17 | 10481049913889360 |
| 18 | 244727123398669044 |
| 19 | 6015958354315188049 |
| 20 | 155261610128701766290 |
| 21 | 4196413541685139001486 |
[1,3,8,29,157,1144,10187,105600,1241794,16287457, 235308853,3708090433,63234233743,1159318599835, 22725352050303,474059968069223,10481049913889360, 244727123398669044,6015958354315188049, 155261610128701766290,4196413541685139001486] |