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| n | a(n) |
|---|---|
| 1 | 545 |
| 2 | 1494 |
| 3 | 4281 |
| 4 | 13616 |
| 5 | 55386 |
| 6 | 242370 |
| 7 | 1165496 |
| 8 | 6248040 |
| 9 | 34487190 |
| 10 | 195981866 |
| 11 | 1145052186 |
| 12 | 6737361360 |
| 13 | 39912443060 |
| 14 | 237978427224 |
| 15 | 1421256784506 |
| 16 | 8501521627826 |
| 17 | 50931916877226 |
| 18 | 305246808679080 |
| 19 | 1830112280897396 |
[545,1494,4281,13616,55386,242370,1165496,6248040, 34487190,195981866,1145052186,6737361360, 39912443060,237978427224,1421256784506, 8501521627826,50931916877226,305246808679080, 1830112280897396] |