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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 63 |
| 5 | 322 |
| 6 | 44683 |
| 7 | 941977 |
| 8 | 4677605 |
| 9 | 668520163 |
| 10 | 21622993111 |
| 11 | 9759873853 |
| 12 | 31135480907413 |
| 13 | 194137920764803 |
| 14 | 64440211018897379 |
| 15 | 3298807094967155971 |
| 16 | 181322497435007616497 |
| 17 | 532556590750629416219 |
| 18 | 665881649529214120845679 |
| 19 | 2596711638295426703997397 |
| 20 | 1031081559092352146579024047 |
[1,1,3,19,63,322,44683,941977,4677605,668520163, 21622993111,9759873853,31135480907413, 194137920764803,64440211018897379, 3298807094967155971,181322497435007616497, 532556590750629416219,665881649529214120845679, 2596711638295426703997397, 1031081559092352146579024047] |