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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 3060 |
| 4 | 29922 |
| 5 | 252912 |
| 6 | 1912914 |
| 7 | 13254601 |
| 8 | 85563043 |
| 9 | 521069404 |
| 10 | 3022541224 |
| 11 | 16826714534 |
| 12 | 90449485556 |
| 13 | 471770734372 |
| 14 | 2397374836954 |
| 15 | 11909366979539 |
| 16 | 57999389713133 |
| 17 | 277578926336176 |
| 18 | 1308191004875392 |
| 19 | 6081976574677816 |
| 20 | 27936365857925926 |
| 21 | 126946765412455656 |
[16,256,3060,29922,252912,1912914,13254601, 85563043,521069404,3022541224,16826714534, 90449485556,471770734372,2397374836954, 11909366979539,57999389713133,277578926336176, 1308191004875392,6081976574677816, 27936365857925926,126946765412455656] |