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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 1 |
| 2 | 1 |
| 3 | 29 |
| 4 | 67 |
| 5 | 1507 |
| 6 | 3121 |
| 7 | 12703 |
| 8 | 164551 |
| 9 | 6344953 |
| 10 | 147727471 |
| 11 | 27529188163 |
| 12 | 710710333 |
| 13 | 271695249739 |
| 14 | 1866529128749 |
| 15 | 21255957303929 |
| 16 | 908965802898697 |
| 17 | 12844144201070519 |
| 18 | 228917805573310159 |
| 19 | 185233029315627847397 |
| 20 | 104416844507809792139 |
| 21 | 45256363943072384591371 |
[3,1,1,29,67,1507,3121,12703,164551,6344953, 147727471,27529188163,710710333,271695249739, 1866529128749,21255957303929,908965802898697, 12844144201070519,228917805573310159, 185233029315627847397,104416844507809792139, 45256363943072384591371] |