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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 33 |
| 4 | 226 |
| 5 | 2420 |
| 6 | 31221 |
| 7 | 525917 |
| 8 | 9960028 |
| 9 | 228028812 |
| 10 | 6582873441 |
| 11 | 203832844657 |
| 12 | 7522104144920 |
| 13 | 307994276065974 |
| 14 | 13236129969377405 |
| 15 | 621482119947376921 |
| 16 | 32898794005805573210 |
| 17 | 1939157848567313376490 |
| 18 | 118255213619653849652599 |
| 19 | 7917287291057332412711339 |
[1,2,7,33,226,2420,31221,525917,9960028,228028812, 6582873441,203832844657,7522104144920, 307994276065974,13236129969377405, 621482119947376921,32898794005805573210, 1939157848567313376490,118255213619653849652599, 7917287291057332412711339] |