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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 153 |
| 3 | 1134 |
| 4 | 7182 |
| 5 | 40824 |
| 6 | 214326 |
| 7 | 1058508 |
| 8 | 4979799 |
| 9 | 22517352 |
| 10 | 98513415 |
| 11 | 419129802 |
| 12 | 1741000716 |
| 13 | 7083045648 |
| 14 | 28296044604 |
| 15 | 111232727064 |
| 16 | 431026817373 |
| 17 | 1648861601184 |
| 18 | 6234757929477 |
| 19 | 23328137324646 |
| 20 | 86451332438394 |
| 21 | 317576323243080 |
| 22 | 1157228874847890 |
| 23 | 4185605730648420 |
[1,16,153,1134,7182,40824,214326,1058508,4979799, 22517352,98513415,419129802,1741000716,7083045648, 28296044604,111232727064,431026817373, 1648861601184,6234757929477,23328137324646, 86451332438394,317576323243080,1157228874847890, 4185605730648420] |