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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 174 |
| 3 | 808 |
| 4 | 4288 |
| 5 | 23932 |
| 6 | 135243 |
| 7 | 754713 |
| 8 | 4245549 |
| 9 | 23848195 |
| 10 | 133798314 |
| 11 | 751604067 |
| 12 | 4222577179 |
| 13 | 23714049081 |
| 14 | 133198003207 |
| 15 | 748199961140 |
| 16 | 4202513392216 |
| 17 | 23605201896388 |
| 18 | 132590921168209 |
| 19 | 744758138601915 |
| 20 | 4183280457347730 |
[3,174,808,4288,23932,135243,754713,4245549, 23848195,133798314,751604067,4222577179, 23714049081,133198003207,748199961140, 4202513392216,23605201896388,132590921168209, 744758138601915,4183280457347730] |