| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 100 |
| 4 | 1556 |
| 5 | 27260 |
| 6 | 515510 |
| 7 | 10284094 |
| 8 | 213433728 |
| 9 | 4566363088 |
| 10 | 100082133066 |
| 11 | 2236952393302 |
| 12 | 50817223209451 |
| 13 | 1170319824912699 |
| 14 | 27268900054818390 |
| 15 | 641812268110993694 |
| 16 | 15239341125950643462 |
| 17 | 364655982858022960206 |
| 18 | 8785745372509009963892 |
| 19 | 212976842702489760621536 |
[1,1,8,100,1556,27260,515510,10284094,213433728, 4566363088,100082133066,2236952393302, 50817223209451,1170319824912699,27268900054818390, 641812268110993694,15239341125950643462, 364655982858022960206,8785745372509009963892, 212976842702489760621536] |