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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 104 |
| 4 | 806 |
| 5 | 6412 |
| 6 | 51908 |
| 7 | 425476 |
| 8 | 3520070 |
| 9 | 29332940 |
| 10 | 245841284 |
| 11 | 2070093632 |
| 12 | 17499188924 |
| 13 | 148414157816 |
| 14 | 1262280506144 |
| 15 | 10762045739644 |
| 16 | 91951462167110 |
| 17 | 787113739061260 |
| 18 | 6749009521216052 |
| 19 | 57954807274992208 |
| 20 | 498334047795436276 |
| 21 | 4290199618047230824 |
[1,2,14,104,806,6412,51908,425476,3520070, 29332940,245841284,2070093632,17499188924, 148414157816,1262280506144,10762045739644, 91951462167110,787113739061260,6749009521216052, 57954807274992208,498334047795436276, 4290199618047230824] |