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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 144 |
| 3 | 976 |
| 4 | 5186 |
| 5 | 22864 |
| 6 | 86066 |
| 7 | 282608 |
| 8 | 824196 |
| 9 | 2171760 |
| 10 | 5256436 |
| 11 | 11846160 |
| 12 | 25099558 |
| 13 | 50379184 |
[1,16,144,976,5186,22864,86066,282608,824196, 2171760,5256436,11846160,25099558,50379184] |