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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 32 |
| 4 | 137 |
| 5 | 603 |
| 6 | 2733 |
| 7 | 12548 |
| 8 | 58366 |
| 9 | 273838 |
| 10 | 1294196 |
| 11 | 6151513 |
| 12 | 29378090 |
| 13 | 140853763 |
| 14 | 677586477 |
| 15 | 3268830837 |
| 16 | 15808422237 |
| 17 | 76615362124 |
| 18 | 372015952802 |
| 19 | 1809389360612 |
| 20 | 8813513314809 |
| 21 | 42987851976842 |
| 22 | 209925510352170 |
| 23 | 1026262594674073 |
| 24 | 5022074492804672 |
| 25 | 24598133511548824 |
| 26 | 120582165717981781 |
[1,2,8,32,137,603,2733,12548,58366,273838,1294196, 6151513,29378090,140853763,677586477,3268830837, 15808422237,76615362124,372015952802, 1809389360612,8813513314809,42987851976842, 209925510352170,1026262594674073,5022074492804672, 24598133511548824,120582165717981781] |