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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 31 |
| 3 | 72 |
| 4 | 306 |
| 5 | 1197 |
| 6 | 4849 |
| 7 | 23037 |
| 8 | 114810 |
| 9 | 603229 |
| 10 | 3319946 |
| 11 | 18585700 |
| 12 | 105379875 |
| 13 | 603107047 |
| 14 | 3467522323 |
| 15 | 19998520262 |
| 16 | 115602617979 |
| 17 | 669078024352 |
| 18 | 3875760664026 |
| 19 | 22464758703891 |
| 20 | 130258464383067 |
| 21 | 755475828119163 |
[8,31,72,306,1197,4849,23037,114810,603229, 3319946,18585700,105379875,603107047,3467522323, 19998520262,115602617979,669078024352, 3875760664026,22464758703891,130258464383067, 755475828119163] |