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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 140 |
| 3 | 1864 |
| 4 | 26602 |
| 5 | 373080 |
| 6 | 5253564 |
| 7 | 73911192 |
| 8 | 1040045475 |
| 9 | 14634444720 |
| 10 | 205922568360 |
| 11 | 2897549559600 |
| 12 | 40771618763540 |
| 13 | 573700205699920 |
| 14 | 8072574516567400 |
| 15 | 113589743388536528 |
| 16 | 1598328982089075749 |
| 17 | 22490195492277648120 |
| 18 | 316461065874934143252 |
[1,8,140,1864,26602,373080,5253564,73911192, 1040045475,14634444720,205922568360,2897549559600, 40771618763540,573700205699920,8072574516567400, 113589743388536528,1598328982089075749, 22490195492277648120,316461065874934143252] |