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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 13 |
| 3 | 83 |
| 4 | 814 |
| 5 | 12502 |
| 6 | 303102 |
| 7 | 11681388 |
| 8 | 718217460 |
| 9 | 70660085940 |
| 10 | 11145552305760 |
| 11 | 2823029266531680 |
| 12 | 1149529177121700960 |
| 13 | 753213189796615454400 |
| 14 | 794745942920930023732800 |
[1,3,13,83,814,12502,303102,11681388,718217460, 70660085940,11145552305760,2823029266531680, 1149529177121700960,753213189796615454400, 794745942920930023732800] |