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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 7 |
| 3 | 22 |
| 4 | 89 |
| 5 | 446 |
| 6 | 2677 |
| 7 | 18741 |
| 8 | 149929 |
| 9 | 1349363 |
| 10 | 13493631 |
| 11 | 148429942 |
| 12 | 1781159305 |
| 13 | 23155070969 |
| 14 | 324170993567 |
| 15 | 4862564903506 |
| 16 | 77801038456097 |
| 17 | 1322617653753653 |
| 18 | 23807117767565755 |
| 19 | 452335237583749354 |
[2,3,7,22,89,446,2677,18741,149929,1349363, 13493631,148429942,1781159305,23155070969, 324170993567,4862564903506,77801038456097, 1322617653753653,23807117767565755, 452335237583749354] |