| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 25 |
| 3 | 168 |
| 4 | 1229 |
| 5 | 9595 |
| 6 | 78527 |
| 7 | 664408 |
| 8 | 5759130 |
| 9 | 50833725 |
| 10 | 455019102 |
| 11 | 4118498801 |
| 12 | 37616575907 |
| 13 | 346165453783 |
| 14 | 3205869110911 |
| 15 | 29851888456753 |
| 16 | 279286334215803 |
| 17 | 2623780688311969 |
| 18 | 24739953477533166 |
| 19 | 234041108830344356 |
| 20 | 2220562531262307905 |
| 21 | 21124612016460745383 |
| 22 | 201448482556532026684 |
| 23 | 1925296277838503159171 |
| 24 | 18437832696789559015711 |
| 25 | 176901280909820032014422 |
[4,25,168,1229,9595,78527,664408,5759130,50833725, 455019102,4118498801,37616575907,346165453783, 3205869110911,29851888456753,279286334215803, 2623780688311969,24739953477533166, 234041108830344356,2220562531262307905, 21124612016460745383,201448482556532026684, 1925296277838503159171,18437832696789559015711, 176901280909820032014422] |