n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 23 |
5 | 166 |
6 | 1437 |
7 | 14512 |
8 | 167491 |
9 | 2174746 |
10 | 31374953 |
11 | 497909380 |
12 | 8619976719 |
13 | 161667969646 |
14 | 3265326093109 |
15 | 70663046421208 |
16 | 1631123626335707 |
17 | 40004637435452866 |
18 | 1038860856732399105 |
19 | 28476428717448349996 |
20 | 821656049857815980455 |
[1,0,1,4,23,166,1437,14512,167491,2174746, 31374953,497909380,8619976719,161667969646, 3265326093109,70663046421208,1631123626335707, 40004637435452866,1038860856732399105, 28476428717448349996,821656049857815980455] |