n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 19 |
6 | 177 |
7 | 1766 |
8 | 26868 |
9 | 421725 |
10 | 7692857 |
11 | 208699781 |
12 | 5420553787 |
13 | 180993613044 |
14 | 7075587523888 |
15 | 278356624078085 |
16 | 11601694011103611 |
17 | 552358618257458385 |
18 | 31520661477937912115 |
19 | 1750572856110551805720 |
[0,0,1,4,19,177,1766,26868,421725,7692857, 208699781,5420553787,180993613044,7075587523888, 278356624078085,11601694011103611, 552358618257458385,31520661477937912115, 1750572856110551805720] |