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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 46 |
| 4 | 350 |
| 5 | 3324 |
| 6 | 37874 |
| 7 | 503458 |
| 8 | 7648564 |
| 9 | 130722474 |
| 10 | 2482437926 |
| 11 | 51856030736 |
| 12 | 1181704007894 |
| 13 | 29172943488602 |
| 14 | 775597634145192 |
| 15 | 22093062633006326 |
| 16 | 671280598744505190 |
| 17 | 21671112459225274300 |
| 18 | 740767465663838556074 |
| 19 | 26727829360555847269034 |
[1,2,8,46,350,3324,37874,503458,7648564,130722474, 2482437926,51856030736,1181704007894, 29172943488602,775597634145192,22093062633006326, 671280598744505190,21671112459225274300, 740767465663838556074,26727829360555847269034] |