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| n | a(n) |
|---|---|
| 1 | 512 |
| 2 | 17536 |
| 3 | 218052 |
| 4 | 1599820 |
| 5 | 8500668 |
| 6 | 36383284 |
| 7 | 133538996 |
| 8 | 437500380 |
| 9 | 1314748124 |
| 10 | 3694894500 |
| 11 | 9849731140 |
| 12 | 25173962492 |
| 13 | 62193359676 |
| 14 | 149475988116 |
| 15 | 351246183572 |
| 16 | 810197361564 |
| 17 | 1840289301660 |
| 18 | 4126688132548 |
| 19 | 9154339355684 |
| 20 | 20122502355004 |
| 21 | 43888598831484 |
[512,17536,218052,1599820,8500668,36383284, 133538996,437500380,1314748124,3694894500, 9849731140,25173962492,62193359676,149475988116, 351246183572,810197361564,1840289301660, 4126688132548,9154339355684,20122502355004, 43888598831484] |