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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 38 |
| 4 | 176 |
| 5 | 782 |
| 6 | 3368 |
| 7 | 14198 |
| 8 | 58976 |
| 9 | 242462 |
| 10 | 989528 |
| 11 | 4017158 |
| 12 | 16245776 |
| 13 | 65514542 |
| 14 | 263652488 |
| 15 | 1059392918 |
| 16 | 4251920576 |
| 17 | 17050729022 |
| 18 | 68332056248 |
| 19 | 273715645478 |
| 20 | 1096024843376 |
| 21 | 4387586157902 |
| 22 | 17560804984808 |
| 23 | 70274600998838 |
[1,2,8,38,176,782,3368,14198,58976,242462,989528, 4017158,16245776,65514542,263652488,1059392918, 4251920576,17050729022,68332056248,273715645478, 1096024843376,4387586157902,17560804984808, 70274600998838] |