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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 7 |
| 4 | 37 |
| 5 | 94 |
| 6 | 587 |
| 7 | 1925 |
| 8 | 13606 |
| 9 | 54217 |
| 10 | 424381 |
| 11 | 1979704 |
| 12 | 16918869 |
| 13 | 90086877 |
| 14 | 831972372 |
| 15 | 4964577987 |
| 16 | 49154794969 |
| 17 | 324183365662 |
| 18 | 3419501188439 |
| 19 | 24655458609377 |
| 20 | 275624716500750 |
| 21 | 2153735319395661 |
| 22 | 25406228456463665 |
| 23 | 213606545948092304 |
| 24 | 2649077873736448473 |
[1,1,4,7,37,94,587,1925,13606,54217,424381, 1979704,16918869,90086877,831972372,4964577987, 49154794969,324183365662,3419501188439, 24655458609377,275624716500750,2153735319395661, 25406228456463665,213606545948092304, 2649077873736448473] |