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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 24 |
| 5 | 72 |
| 6 | 227 |
| 7 | 730 |
| 8 | 2384 |
| 9 | 7916 |
| 10 | 26704 |
| 11 | 91280 |
| 12 | 315319 |
| 13 | 1098710 |
| 14 | 3856948 |
| 15 | 13628441 |
| 16 | 48435808 |
| 17 | 173030048 |
| 18 | 620965396 |
| 19 | 2237681720 |
| 20 | 8093572960 |
| 21 | 29372735368 |
| 22 | 106925552672 |
| 23 | 390336084256 |
| 24 | 1428620011263 |
| 25 | 5241166583502 |
| 26 | 19270575881964 |
[1,2,4,9,24,72,227,730,2384,7916,26704,91280, 315319,1098710,3856948,13628441,48435808, 173030048,620965396,2237681720,8093572960, 29372735368,106925552672,390336084256, 1428620011263,5241166583502,19270575881964] |