| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 19 |
| 4 | 99 |
| 5 | 653 |
| 6 | 5187 |
| 7 | 48117 |
| 8 | 510271 |
| 9 | 6088301 |
| 10 | 80716427 |
| 11 | 1177130893 |
| 12 | 18727404639 |
| 13 | 322769897573 |
| 14 | 5990916997611 |
| 15 | 119139798166245 |
| 16 | 2527255556219167 |
| 17 | 56960055683893853 |
| 18 | 1359299747696197931 |
| 19 | 34240584053654816797 |
| 20 | 907911436336049691519 |
| 21 | 25277557586594907583733 |
| 22 | 737276033151104902965963 |
[1,2,5,19,99,653,5187,48117,510271,6088301, 80716427,1177130893,18727404639,322769897573, 5990916997611,119139798166245,2527255556219167, 56960055683893853,1359299747696197931, 34240584053654816797,907911436336049691519, 25277557586594907583733,737276033151104902965963] |