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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 57 |
| 5 | 62 |
| 6 | 553 |
| 7 | 615 |
| 8 | 7318 |
| 9 | 15251 |
| 10 | 22569 |
| 11 | 37820 |
| 12 | 1837929 |
| 13 | 1875749 |
| 14 | 3713678 |
| 15 | 9303105 |
| 16 | 106047833 |
| 17 | 115350938 |
| 18 | 1028855337 |
| 19 | 1144206275 |
| 20 | 13615124362 |
| 21 | 28374454999 |
| 22 | 41989579361 |
| 23 | 70364034360 |
| 24 | 3419463228641 |
| 25 | 3489827263001 |
| 26 | 6909290491642 |
| 27 | 17308408246285 |
[1,1,2,5,57,62,553,615,7318,15251,22569,37820, 1837929,1875749,3713678,9303105,106047833, 115350938,1028855337,1144206275,13615124362, 28374454999,41989579361,70364034360,3419463228641, 3489827263001,6909290491642,17308408246285] |