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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 11 |
| 4 | 85 |
| 5 | 739 |
| 6 | 7831 |
| 7 | 96641 |
| 8 | 1363209 |
| 9 | 21632759 |
| 10 | 381433771 |
| 11 | 7398080029 |
| 12 | 156533563693 |
| 13 | 3588046200179 |
| 14 | 88571349871551 |
| 15 | 2342565398442569 |
| 16 | 66087436823953681 |
| 17 | 1980956920420309231 |
| 18 | 62871632567144951635 |
| 19 | 2106277265332074827573 |
| 20 | 74276723394195659799861 |
[1,0,3,11,85,739,7831,96641,1363209,21632759, 381433771,7398080029,156533563693,3588046200179, 88571349871551,2342565398442569,66087436823953681, 1980956920420309231,62871632567144951635, 2106277265332074827573,74276723394195659799861] |