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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 8 |
| 9 | 64 |
| 10 | 400 |
| 11 | 2465 |
| 12 | 14092 |
| 13 | 80016 |
| 14 | 442248 |
| 15 | 2442351 |
| 16 | 13375366 |
| 17 | 73477622 |
| 18 | 403703404 |
| 19 | 2230591660 |
| 20 | 12380801756 |
| 21 | 69225756076 |
| 22 | 389806286920 |
| 23 | 2213844625658 |
| 24 | 12681996193252 |
| 25 | 73339826141716 |
| 26 | 428242854338216 |
| 27 | 2526129602115517 |
| 28 | 15056977593085444 |
| 29 | 90712249806247400 |
[1,8,64,400,2465,14092,80016,442248,2442351, 13375366,73477622,403703404,2230591660, 12380801756,69225756076,389806286920, 2213844625658,12681996193252,73339826141716, 428242854338216,2526129602115517, 15056977593085444,90712249806247400] |