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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 19 |
| 3 | 292 |
| 4 | 6053 |
| 5 | 156454 |
| 6 | 4821751 |
| 7 | 172091336 |
| 8 | 6967703113 |
| 9 | 315139591882 |
| 10 | 15732501109211 |
| 11 | 858638989668844 |
| 12 | 50831174705612269 |
| 13 | 3242711167070593262 |
| 14 | 221681733241307827903 |
| 15 | 16162941921207795907984 |
| 16 | 1251634963086341967917201 |
| 17 | 102570238312410247255627666 |
[1,2,19,292,6053,156454,4821751,172091336, 6967703113,315139591882,15732501109211, 858638989668844,50831174705612269, 3242711167070593262,221681733241307827903, 16162941921207795907984,1251634963086341967917201, 102570238312410247255627666] |