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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 76 |
| 5 | 365 |
| 6 | 9906 |
| 7 | 94507 |
| 8 | 2832824 |
| 9 | 43209945 |
| 10 | 1438766830 |
| 11 | 30971280791 |
| 12 | 1146868043124 |
| 13 | 32166137748901 |
| 14 | 1322928667341386 |
| 15 | 45791799761422275 |
| 16 | 2085517396191903856 |
| 17 | 85748423669245738673 |
| 18 | 4306944218393176448742 |
| 19 | 204597526239295278145327 |
[1,0,2,3,76,365,9906,94507,2832824,43209945, 1438766830,30971280791,1146868043124, 32166137748901,1322928667341386,45791799761422275, 2085517396191903856,85748423669245738673, 4306944218393176448742,204597526239295278145327] |