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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 112 |
| 4 | 2202 |
| 5 | 55641 |
| 6 | 1724050 |
| 7 | 63550446 |
| 8 | 2725133134 |
| 9 | 133546286188 |
| 10 | 7370574862110 |
| 11 | 452601918694564 |
| 12 | 30610161317492690 |
| 13 | 2260721225822606054 |
| 14 | 181023122013996360316 |
| 15 | 15619416644091171417138 |
| 16 | 1444615406376578862379054 |
| 17 | 142565035949775130517868740 |
[1,1,8,112,2202,55641,1724050,63550446,2725133134, 133546286188,7370574862110,452601918694564, 30610161317492690,2260721225822606054, 181023122013996360316,15619416644091171417138, 1444615406376578862379054, 142565035949775130517868740] |