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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 8 |
| 6 | 2 |
| 7 | 4 |
| 8 | 36 |
| 9 | 36 |
| 10 | 4 |
| 11 | 12 |
| 12 | 544 |
| 13 | 3216 |
| 14 | 544 |
| 15 | 12 |
| 16 | 44 |
| 17 | 12700 |
| 18 | 257664 |
| 19 | 257664 |
| 20 | 12700 |
| 21 | 44 |
| 22 | 176 |
| 23 | 431432 |
| 24 | 69822004 |
| 25 | 464458656 |
| 26 | 69822004 |
| 27 | 431432 |
| 28 | 176 |
| 29 | 768 |
| 30 | 17482140 |
[0,1,1,2,8,2,4,36,36,4,12,544,3216,544,12,44, 12700,257664,257664,12700,44,176,431432,69822004, 464458656,69822004,431432,176,768,17482140] |