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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 52 |
| 3 | 1192 |
| 4 | 36628 |
| 5 | 1297504 |
| 6 | 50419096 |
| 7 | 2099649808 |
| 8 | 92239977748 |
| 9 | 4225417349872 |
| 10 | 200149545055552 |
| 11 | 9743739840316288 |
| 12 | 485293084757188504 |
| 13 | 24641572224240907264 |
| 14 | 1272101807179840322416 |
| 15 | 66620238759427147324192 |
| 16 | 3532989709864148362611988 |
| 17 | 189447449844340069835395984 |
[1,4,52,1192,36628,1297504,50419096,2099649808, 92239977748,4225417349872,200149545055552, 9743739840316288,485293084757188504, 24641572224240907264,1272101807179840322416, 66620238759427147324192,3532989709864148362611988, 189447449844340069835395984] |