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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 113 |
| 5 | 986 |
| 6 | 10237 |
| 7 | 123096 |
| 8 | 1680737 |
| 9 | 25668766 |
| 10 | 433329461 |
| 11 | 8009178596 |
| 12 | 160802065393 |
| 13 | 3483842906610 |
| 14 | 80992799730221 |
| 15 | 2010720004254856 |
| 16 | 53081510001375041 |
| 17 | 1484613248976841958 |
| 18 | 43846812123456425221 |
| 19 | 1363477059263944382604 |
[1,1,3,16,113,986,10237,123096,1680737,25668766, 433329461,8009178596,160802065393,3483842906610, 80992799730221,2010720004254856,53081510001375041, 1484613248976841958,43846812123456425221, 1363477059263944382604] |