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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 8 |
| 4 | 15 |
| 5 | 54 |
| 6 | 114 |
| 7 | 231 |
| 8 | 596 |
| 9 | 1462 |
| 10 | 3349 |
| 11 | 7894 |
| 12 | 19344 |
| 13 | 46083 |
| 14 | 109006 |
| 15 | 262862 |
| 16 | 631513 |
| 17 | 1506764 |
| 18 | 3614398 |
| 19 | 8682865 |
| 20 | 20808082 |
| 21 | 49898254 |
| 22 | 119810337 |
| 23 | 287572788 |
| 24 | 690178246 |
| 25 | 1657383439 |
| 26 | 3980822218 |
| 27 | 9561564308 |
| 28 | 22971976895 |
| 29 | 55204857432 |
| 30 | 132683125294 |
[0,8,8,15,54,114,231,596,1462,3349,7894,19344, 46083,109006,262862,631513,1506764,3614398, 8682865,20808082,49898254,119810337,287572788, 690178246,1657383439,3980822218,9561564308, 22971976895,55204857432,132683125294] |