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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 39 |
| 3 | 248 |
| 4 | 1559 |
| 5 | 9793 |
| 6 | 61529 |
| 7 | 386598 |
| 8 | 2429064 |
| 9 | 15262259 |
| 10 | 95895601 |
| 11 | 602529829 |
| 12 | 3785806568 |
| 13 | 23786924201 |
| 14 | 149457652642 |
| 15 | 939070127125 |
| 16 | 5900351625162 |
| 17 | 37073002638414 |
| 18 | 232936545470713 |
| 19 | 1463583480006755 |
| 20 | 9195966217409213 |
| 21 | 57779959822545404 |
| 22 | 363042194606444109 |
| 23 | 2281061383037441740 |
[1,6,39,248,1559,9793,61529,386598,2429064, 15262259,95895601,602529829,3785806568, 23786924201,149457652642,939070127125, 5900351625162,37073002638414,232936545470713, 1463583480006755,9195966217409213, 57779959822545404,363042194606444109, 2281061383037441740] |