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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 31 |
| 5 | 111 |
| 6 | 449 |
| 7 | 1819 |
| 8 | 7720 |
| 9 | 33168 |
| 10 | 145938 |
| 11 | 649121 |
| 12 | 2928423 |
| 13 | 13329644 |
| 14 | 61233113 |
| 15 | 283276432 |
| 16 | 1319087860 |
| 17 | 6175891798 |
| 18 | 29058459670 |
| 19 | 137308405543 |
| 20 | 651318916557 |
| 21 | 3100055975387 |
| 22 | 14800606807470 |
| 23 | 70857861401493 |
| 24 | 340081464183191 |
| 25 | 1635921872887769 |
| 26 | 7885698053327415 |
| 27 | 38083566352583067 |
[1,1,3,8,31,111,449,1819,7720,33168,145938,649121, 2928423,13329644,61233113,283276432,1319087860, 6175891798,29058459670,137308405543,651318916557, 3100055975387,14800606807470,70857861401493, 340081464183191,1635921872887769,7885698053327415, 38083566352583067] |