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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 32 |
| 4 | 140 |
| 5 | 617 |
| 6 | 2833 |
| 7 | 13023 |
| 8 | 61051 |
| 9 | 286985 |
| 10 | 1362993 |
| 11 | 6490277 |
| 12 | 31095769 |
| 13 | 149316400 |
| 14 | 719881023 |
| 15 | 3477149010 |
| 16 | 16841970459 |
| 17 | 81704281033 |
| 18 | 397171081932 |
| 19 | 1933229347169 |
| 20 | 9424536022275 |
| 21 | 45996120235591 |
| 22 | 224756168100779 |
| 23 | 1099295755970498 |
| 24 | 5382038943075592 |
| 25 | 26371391810360854 |
| 26 | 129323007857861106 |
[1,2,8,32,140,617,2833,13023,61051,286985,1362993, 6490277,31095769,149316400,719881023,3477149010, 16841970459,81704281033,397171081932, 1933229347169,9424536022275,45996120235591, 224756168100779,1099295755970498,5382038943075592, 26371391810360854,129323007857861106] |