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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 23 |
| 4 | 162 |
| 5 | 1382 |
| 6 | 14236 |
| 7 | 170872 |
| 8 | 2344530 |
| 9 | 36188534 |
| 10 | 620652000 |
| 11 | 11708927276 |
| 12 | 240976560622 |
| 13 | 5372724404530 |
| 14 | 129002764437228 |
| 15 | 3318690040767224 |
| 16 | 91067432174168202 |
| 17 | 2655146132506208558 |
| 18 | 81966680980803524728 |
| 19 | 2670959894858615348356 |
| 20 | 91616517379045122841830 |
[1,5,23,162,1382,14236,170872,2344530,36188534, 620652000,11708927276,240976560622,5372724404530, 129002764437228,3318690040767224, 91067432174168202,2655146132506208558, 81966680980803524728,2670959894858615348356, 91616517379045122841830] |