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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 69 |
| 4 | 1196 |
| 5 | 27900 |
| 6 | 820554 |
| 7 | 29168048 |
| 8 | 1216826120 |
| 9 | 58301363808 |
| 10 | 3155539049040 |
| 11 | 190434409300872 |
| 12 | 12679792851087768 |
| 13 | 923409652630222680 |
| 14 | 73016802381788896344 |
| 15 | 6230201355664856039640 |
| 16 | 570574779781503603910464 |
| 17 | 55826084651771645745562368 |
[1,1,6,69,1196,27900,820554,29168048,1216826120, 58301363808,3155539049040,190434409300872, 12679792851087768,923409652630222680, 73016802381788896344,6230201355664856039640, 570574779781503603910464, 55826084651771645745562368] |