| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 53 |
| 5 | 118 |
| 6 | 525 |
| 7 | 1168 |
| 8 | 5197 |
| 9 | 32350 |
| 10 | 69897 |
| 11 | 451732 |
| 12 | 1876825 |
| 13 | 4205382 |
| 14 | 18698353 |
| 15 | 116395500 |
| 16 | 717071353 |
| 17 | 1550538206 |
| 18 | 10020300589 |
| 19 | 41631740562 |
| 20 | 93283781713 |
| 21 | 601334430840 |
| 22 | 2498621505073 |
| 23 | 15593063461278 |
| 24 | 127243129195297 |
[1,2,5,12,53,118,525,1168,5197,32350,69897,451732, 1876825,4205382,18698353,116395500,717071353, 1550538206,10020300589,41631740562,93283781713, 601334430840,2498621505073,15593063461278, 127243129195297] |