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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 41 |
| 3 | 181 |
| 4 | 756 |
| 5 | 3121 |
| 6 | 12793 |
| 7 | 51845 |
| 8 | 209093 |
| 9 | 840557 |
| 10 | 3372677 |
| 11 | 13519197 |
| 12 | 54152373 |
| 13 | 216828845 |
| 14 | 867920933 |
| 15 | 3473494397 |
[1,8,41,181,756,3121,12793,51845,209093,840557, 3372677,13519197,54152373,216828845,867920933, 3473494397] |