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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 194 |
| 4 | 3631 |
| 5 | 89712 |
| 6 | 2764268 |
| 7 | 102207394 |
| 8 | 4411265695 |
| 9 | 217707856946 |
| 10 | 12092696127691 |
| 11 | 746552539553152 |
| 12 | 50708165735187572 |
| 13 | 3757864633323765824 |
| 14 | 301719332111553586612 |
| 15 | 26089939284112306045362 |
| 16 | 2417245528055399202851119 |
[1,2,15,194,3631,89712,2764268,102207394, 4411265695,217707856946,12092696127691, 746552539553152,50708165735187572, 3757864633323765824,301719332111553586612, 26089939284112306045362,2417245528055399202851119] |