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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 768 |
| 4 | 2421 |
| 5 | 8736 |
| 6 | 33088 |
| 7 | 131355 |
| 8 | 533568 |
| 9 | 2203920 |
| 10 | 9189085 |
| 11 | 38550096 |
| 12 | 162319248 |
| 13 | 685048923 |
| 14 | 2895251008 |
| 15 | 12247097568 |
| 16 | 51834040005 |
| 17 | 219453561408 |
| 18 | 929308800928 |
| 19 | 3935800405563 |
| 20 | 16670184835968 |
| 21 | 70610452390128 |
[16,256,768,2421,8736,33088,131355,533568,2203920, 9189085,38550096,162319248,685048923,2895251008, 12247097568,51834040005,219453561408,929308800928, 3935800405563,16670184835968,70610452390128] |