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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 132 |
| 3 | 11140 |
| 4 | 1763076 |
| 5 | 449262724 |
| 6 | 168055179012 |
| 7 | 86720706877060 |
| 8 | 59029852191779076 |
| 9 | 51241585497612147844 |
| 10 | 55245853646893977682692 |
| 11 | 72423868722672448652558980 |
| 12 | 113447698393867318106045295876 |
| 13 | 209271794145089904620369489016964 |
[1,4,132,11140,1763076,449262724,168055179012, 86720706877060,59029852191779076, 51241585497612147844,55245853646893977682692, 72423868722672448652558980, 113447698393867318106045295876, 209271794145089904620369489016964] |