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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 22 |
| 4 | 226 |
| 5 | 1371 |
| 6 | 5901 |
| 7 | 20097 |
| 8 | 57813 |
| 9 | 146427 |
| 10 | 335742 |
| 11 | 710677 |
| 12 | 1408693 |
| 13 | 2643004 |
| 14 | 4732728 |
| 15 | 8141238 |
| 16 | 13524078 |
| 17 | 21787914 |
| 18 | 34162095 |
| 19 | 52284504 |
| 20 | 78303484 |
| 21 | 114997729 |
| 22 | 165916135 |
| 23 | 235539711 |
| 24 | 329467755 |
| 25 | 454630605 |
| 26 | 619531380 |
| 27 | 834519231 |
[1,22,226,1371,5901,20097,57813,146427,335742, 710677,1408693,2643004,4732728,8141238,13524078, 21787914,34162095,52284504,78303484,114997729, 165916135,235539711,329467755,454630605,619531380, 834519231] |