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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 13 |
| 4 | 71 |
| 5 | 558 |
| 6 | 5344 |
| 7 | 60926 |
| 8 | 766898 |
| 9 | 10759096 |
| 10 | 168848256 |
| 11 | 2947203048 |
| 12 | 56368708824 |
| 13 | 1165246323408 |
| 14 | 25802649445728 |
| 15 | 609940593443952 |
| 16 | 15377212949988624 |
| 17 | 412827548455415040 |
| 18 | 11764577341464710016 |
| 19 | 354392697960438122880 |
| 20 | 11237993013428254071936 |
[0,1,2,13,71,558,5344,60926,766898,10759096, 168848256,2947203048,56368708824,1165246323408, 25802649445728,609940593443952,15377212949988624, 412827548455415040,11764577341464710016, 354392697960438122880,11237993013428254071936] |