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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 13 |
| 4 | 202 |
| 5 | 9390 |
| 6 | 1531336 |
| 7 | 880492496 |
| 8 | 1792477159408 |
| 9 | 13026163465206704 |
| 10 | 341247403996148180800 |
| 11 | 32522568124623933138617088 |
| 12 | 11366712907916015518547782806784 |
| 13 | 14669074325967499043636521641422216704 |
| 14 | 70315641946149306808455637518883828774996992 |
[1,0,2,13,202,9390,1531336,880492496, 1792477159408,13026163465206704, 341247403996148180800,32522568124623933138617088, 11366712907916015518547782806784, 14669074325967499043636521641422216704, 70315641946149306808455637518883828774996992] |