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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 76 |
| 4 | 724 |
| 5 | 8368 |
| 6 | 113792 |
| 7 | 1771824 |
| 8 | 31001424 |
| 9 | 601677888 |
| 10 | 12818974848 |
| 11 | 297223165248 |
| 12 | 7446226027584 |
| 13 | 200354793323904 |
| 14 | 5760239869401984 |
| 15 | 176170480317568512 |
| 16 | 5709535272618925824 |
| 17 | 195419487662892221184 |
| 18 | 7042458625343222876928 |
| 19 | 266500916470984705887744 |
[1,2,10,76,724,8368,113792,1771824,31001424, 601677888,12818974848,297223165248,7446226027584, 200354793323904,5760239869401984, 176170480317568512,5709535272618925824, 195419487662892221184,7042458625343222876928, 266500916470984705887744] |