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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 136 |
| 5 | 8256 |
| 6 | 1405440 |
| 7 | 602922752 |
| 8 | 618218766848 |
| 9 | 1468496379454976 |
| 10 | 7913439173996188672 |
| 11 | 95288304033198904688640 |
| 12 | 2534320562857451371729985536 |
| 13 | 147510069367873486819642346127360 |
| 14 | 18647939279377935249755798151259226112 |
[1,2,8,136,8256,1405440,602922752,618218766848, 1468496379454976,7913439173996188672, 95288304033198904688640, 2534320562857451371729985536, 147510069367873486819642346127360, 18647939279377935249755798151259226112] |