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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 19 |
| 3 | 19 |
| 4 | 99 |
| 5 | 138 |
| 6 | 197 |
| 7 | 380 |
| 8 | 2580 |
| 9 | 5892 |
| 10 | 10199 |
| 11 | 47851 |
| 12 | 139642 |
| 13 | 450312 |
| 14 | 1068661 |
| 15 | 2955411 |
| 16 | 13601486 |
| 17 | 48492065 |
[0,19,19,99,138,197,380,2580,5892,10199,47851, 139642,450312,1068661,2955411,13601486,48492065] |