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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 20 |
| 4 | 136 |
| 5 | 1024 |
| 6 | 10208 |
| 7 | 103872 |
| 8 | 1287424 |
| 9 | 17001984 |
| 10 | 252383232 |
| 11 | 3971122176 |
| 12 | 69973813248 |
| 13 | 1281307791360 |
| 14 | 25646098022400 |
| 15 | 540521184067584 |
| 16 | 12170993370955776 |
| 17 | 286967313311858688 |
| 18 | 7206454521728335872 |
| 19 | 188326525698968518656 |
[1,1,4,20,136,1024,10208,103872,1287424,17001984, 252383232,3971122176,69973813248,1281307791360, 25646098022400,540521184067584,12170993370955776, 286967313311858688,7206454521728335872, 188326525698968518656] |