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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 29 |
| 5 | 78 |
| 6 | 338 |
| 7 | 1058 |
| 8 | 4698 |
| 9 | 15815 |
| 10 | 71857 |
| 11 | 254131 |
| 12 | 1171908 |
| 13 | 4300017 |
| 14 | 20035297 |
| 15 | 75618646 |
| 16 | 355106839 |
| 17 | 1370474585 |
| 18 | 6475644291 |
| 19 | 25446998630 |
| 20 | 120843594317 |
| 21 | 482024049999 |
| 22 | 2298547334634 |
| 23 | 9284776929847 |
| 24 | 44428692153983 |
| 25 | 181411707530385 |
| 26 | 870640865259852 |
| 27 | 3588376805328084 |
| 28 | 17265370230610681 |
[1,1,3,7,29,78,338,1058,4698,15815,71857,254131, 1171908,4300017,20035297,75618646,355106839, 1370474585,6475644291,25446998630,120843594317, 482024049999,2298547334634,9284776929847, 44428692153983,181411707530385,870640865259852, 3588376805328084,17265370230610681] |