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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 18 |
| 3 | 44 |
| 4 | 192 |
| 5 | 315 |
| 6 | 3396 |
| 7 | 8556 |
| 8 | 13327 |
| 9 | 81785 |
| 10 | 279267 |
| 11 | 865357 |
| 12 | 1799674 |
| 13 | 1727603 |
| 14 | 8760851 |
| 15 | 63416791 |
| 16 | 106892452 |
[0,2,18,44,192,315,3396,8556,13327,81785,279267, 865357,1799674,1727603,8760851,63416791,106892452] |