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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 46 |
| 4 | 371 |
| 5 | 2611 |
| 6 | 22444 |
| 7 | 163010 |
| 8 | 1414763 |
| 9 | 10666423 |
| 10 | 92901977 |
| 11 | 700765693 |
| 12 | 6267591344 |
| 13 | 47400875250 |
| 14 | 421269688378 |
| 15 | 3261487427911 |
| 16 | 28956966303371 |
| 17 | 222519855315655 |
| 18 | 2011947117233155 |
| 19 | 15451470070634425 |
| 20 | 138876292766145541 |
| 21 | 1085821838608348370 |
| 22 | 9706788507990083429 |
[1,7,46,371,2611,22444,163010,1414763,10666423, 92901977,700765693,6267591344,47400875250, 421269688378,3261487427911,28956966303371, 222519855315655,2011947117233155, 15451470070634425,138876292766145541, 1085821838608348370,9706788507990083429] |