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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 23 |
| 4 | 107 |
| 5 | 587 |
| 6 | 3725 |
| 7 | 26952 |
| 8 | 219756 |
| 9 | 1998951 |
| 10 | 20105485 |
| 11 | 221838905 |
| 12 | 2666280457 |
| 13 | 34689290378 |
| 14 | 485840964614 |
| 15 | 7288997427755 |
| 16 | 116634438986227 |
| 17 | 1982868327635663 |
| 18 | 35692311974248093 |
| 19 | 678159760252918824 |
| 20 | 13563246929216611852 |
| 21 | 284828660383365005643 |
[1,2,6,23,107,587,3725,26952,219756,1998951, 20105485,221838905,2666280457,34689290378, 485840964614,7288997427755,116634438986227, 1982868327635663,35692311974248093, 678159760252918824,13563246929216611852, 284828660383365005643] |