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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 54 |
| 4 | 1928 |
| 5 | 167770 |
| 6 | 34128972 |
| 7 | 15867798142 |
| 8 | 16621680303888 |
| 9 | 38813463431274402 |
| 10 | 200266228576991017940 |
| 11 | 2265670919773168963168454 |
| 12 | 55816752493202168837392763544 |
| 13 | 2976116188645489878229876218205674 |
| 14 | 341574630434025162744892242114482410332 |
[1,1,4,54,1928,167770,34128972,15867798142, 16621680303888,38813463431274402, 200266228576991017940,2265670919773168963168454, 55816752493202168837392763544, 2976116188645489878229876218205674, 341574630434025162744892242114482410332] |