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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 408 |
| 4 | 14799 |
| 5 | 817743 |
| 6 | 61621806 |
| 7 | 5921141502 |
| 8 | 694008501627 |
| 9 | 96176405390961 |
| 10 | 15400332946269903 |
| 11 | 2799678523675400832 |
| 12 | 569877183695866859625 |
| 13 | 128436925725088289658534 |
| 14 | 31756620986815666396814796 |
| 15 | 8548059658831271609064999978 |
| 16 | 2488568825786280454788465874035 |
| 17 | 779186768737628124697943895022101 |
[1,3,21,408,14799,817743,61621806,5921141502, 694008501627,96176405390961,15400332946269903, 2799678523675400832,569877183695866859625, 128436925725088289658534, 31756620986815666396814796, 8548059658831271609064999978, 2488568825786280454788465874035, 779186768737628124697943895022101] |