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| n | a(n) |
|---|---|
| 4 | 16 |
| 5 | 125 |
| 6 | 680 |
| 7 | 3135 |
| 8 | 13155 |
| 9 | 51873 |
| 10 | 195821 |
| 11 | 715614 |
| 12 | 2550577 |
| 13 | 8911942 |
| 14 | 30640888 |
| 15 | 103951415 |
| 16 | 348724844 |
| 17 | 1158722880 |
| 18 | 3818514232 |
| 19 | 12493703403 |
| 20 | 40620949971 |
| 21 | 131336770375 |
| 22 | 422536529249 |
| 23 | 1353341880777 |
| 24 | 4317248276746 |
| 25 | 13722302173753 |
[16,125,680,3135,13155,51873,195821,715614, 2550577,8911942,30640888,103951415,348724844, 1158722880,3818514232,12493703403,40620949971, 131336770375,422536529249,1353341880777, 4317248276746,13722302173753] |