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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 35 |
| 5 | 98 |
| 6 | 431 |
| 7 | 1361 |
| 8 | 6203 |
| 9 | 21117 |
| 10 | 97367 |
| 11 | 349863 |
| 12 | 1628534 |
| 13 | 6075216 |
| 14 | 28476830 |
| 15 | 109268287 |
| 16 | 514736603 |
| 17 | 2019723490 |
| 18 | 9551131625 |
| 19 | 38146488279 |
| 20 | 180943166799 |
| 21 | 733323214843 |
| 22 | 3486859436279 |
| 23 | 14304847475503 |
| 24 | 68153275274225 |
| 25 | 282505125588502 |
| 26 | 1348167924533795 |
| 27 | 5638208585217986 |
| 28 | 26943787555922353 |
[1,1,4,8,35,98,431,1361,6203,21117,97367,349863, 1628534,6075216,28476830,109268287,514736603, 2019723490,9551131625,38146488279,180943166799, 733323214843,3486859436279,14304847475503, 68153275274225,282505125588502,1348167924533795, 5638208585217986,26943787555922353] |