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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 34 |
| 3 | 428 |
| 4 | 5628 |
| 5 | 75926 |
| 6 | 1041876 |
| 7 | 14471417 |
| 8 | 202839843 |
| 9 | 2863267846 |
| 10 | 40646324515 |
| 11 | 579673788822 |
| 12 | 8298771433240 |
| 13 | 119193890037793 |
| 14 | 1716729717777120 |
| 15 | 24785397074603618 |
| 16 | 358595277154362550 |
| 17 | 5197804355574056304 |
| 18 | 75466114062838427516 |
| 19 | 1097299074257879775625 |
[1,3,34,428,5628,75926,1041876,14471417,202839843, 2863267846,40646324515,579673788822,8298771433240, 119193890037793,1716729717777120, 24785397074603618,358595277154362550, 5197804355574056304,75466114062838427516, 1097299074257879775625] |