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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 25 |
| 3 | 152 |
| 4 | 1151 |
| 5 | 8415 |
| 6 | 61796 |
| 7 | 453553 |
| 8 | 3329201 |
| 9 | 24436772 |
| 10 | 179369495 |
| 11 | 1316598259 |
| 12 | 9664023496 |
| 13 | 70935343213 |
| 14 | 520675774985 |
| 15 | 3821836201340 |
| 16 | 28052835663739 |
| 17 | 205911909175803 |
| 18 | 1511423474214692 |
| 19 | 11094068951867649 |
| 20 | 81432085718227557 |
[1,25,152,1151,8415,61796,453553,3329201,24436772, 179369495,1316598259,9664023496,70935343213, 520675774985,3821836201340,28052835663739, 205911909175803,1511423474214692, 11094068951867649,81432085718227557] |