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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 62 |
| 3 | 1626 |
| 4 | 59928 |
| 5 | 2844120 |
| 6 | 165100752 |
| 7 | 11331597942 |
| 8 | 897635712384 |
| 9 | 80602042275756 |
| 10 | 8090067511468800 |
| 11 | 897561658361441106 |
| 12 | 109072492644378442752 |
| 13 | 14407931244544181001216 |
| 14 | 2055559499598438969956352 |
| 15 | 314997663481165477898736750 |
| 16 | 51601245736595962597616222208 |
[1,4,62,1626,59928,2844120,165100752,11331597942, 897635712384,80602042275756,8090067511468800, 897561658361441106,109072492644378442752, 14407931244544181001216,2055559499598438969956352, 314997663481165477898736750, 51601245736595962597616222208] |