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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 43 |
| 4 | 1076 |
| 5 | 58746 |
| 6 | 6772360 |
| 7 | 1619251271 |
| 8 | 794625904404 |
| 9 | 795206398610710 |
| 10 | 1615965837952912216 |
| 11 | 6649024230536100958062 |
| 12 | 55277445682961080929146824 |
| 13 | 927088288759058912165347148404 |
| 14 | 31329256772332779793923906186541200 |
[1,1,4,43,1076,58746,6772360,1619251271, 794625904404,795206398610710,1615965837952912216, 6649024230536100958062,55277445682961080929146824, 927088288759058912165347148404, 31329256772332779793923906186541200] |