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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 78 |
| 4 | 469 |
| 5 | 3501 |
| 6 | 22144 |
| 7 | 144476 |
| 8 | 899432 |
| 9 | 5585508 |
| 10 | 34092855 |
| 11 | 206571444 |
| 12 | 1241016042 |
| 13 | 7407467656 |
| 14 | 43975776229 |
| 15 | 259779839242 |
| 16 | 1528563721468 |
| 17 | 8960651209082 |
| 18 | 52368047294410 |
| 19 | 305173796833144 |
| 20 | 1774059940879290 |
| 21 | 10289839706255591 |
| 22 | 59564855651625602 |
| 23 | 344177608427972004 |
| 24 | 1985502681113986836 |
[1,6,78,469,3501,22144,144476,899432,5585508, 34092855,206571444,1241016042,7407467656, 43975776229,259779839242,1528563721468, 8960651209082,52368047294410,305173796833144, 1774059940879290,10289839706255591, 59564855651625602,344177608427972004, 1985502681113986836] |