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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 90 |
| 5 | 5289 |
| 6 | 1071691 |
| 7 | 712342075 |
| 8 | 1585944117738 |
| 9 | 12152982231404393 |
| 10 | 328276896613548366675 |
| 11 | 31834464336872565979301363 |
| 12 | 11234630426387288679040317490771 |
| 13 | 14576388456695908232721134339830232699 |
| 14 | 70075904005979773819582865772534172929477101 |
[1,0,1,5,90,5289,1071691,712342075,1585944117738, 12152982231404393,328276896613548366675, 31834464336872565979301363, 11234630426387288679040317490771, 14576388456695908232721134339830232699, 70075904005979773819582865772534172929477101] |