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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 49 |
| 5 | 276 |
| 6 | 1503 |
| 7 | 8059 |
| 8 | 42879 |
| 9 | 227209 |
| 10 | 1201198 |
| 11 | 6342065 |
| 12 | 33458422 |
| 13 | 176429692 |
| 14 | 930053109 |
| 15 | 4901862563 |
| 16 | 25832186354 |
| 17 | 136121375543 |
| 18 | 717246503129 |
| 19 | 3779158936550 |
| 20 | 19911845173978 |
| 21 | 104910949948156 |
| 22 | 552745637139767 |
| 23 | 2912235695490122 |
[1,8,49,276,1503,8059,42879,227209,1201198, 6342065,33458422,176429692,930053109,4901862563, 25832186354,136121375543,717246503129, 3779158936550,19911845173978,104910949948156, 552745637139767,2912235695490122] |