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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 28 |
| 4 | 245 |
| 5 | 2816 |
| 6 | 40537 |
| 7 | 702976 |
| 8 | 14270153 |
| 9 | 332102656 |
| 10 | 8719631981 |
| 11 | 255020847104 |
| 12 | 8222803663549 |
| 13 | 289815184113664 |
| 14 | 11085650268060929 |
| 15 | 457386463819595776 |
| 16 | 20248713707077863953 |
| 17 | 957435459515190345728 |
| 18 | 48157934732749633188565 |
[1,1,5,28,245,2816,40537,702976,14270153, 332102656,8719631981,255020847104,8222803663549, 289815184113664,11085650268060929, 457386463819595776,20248713707077863953, 957435459515190345728,48157934732749633188565] |