n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 7 |
7 | 21 |
8 | 47 |
9 | 193 |
10 | 927 |
11 | 6473 |
12 | 56977 |
13 | 532817 |
14 | 5726035 |
15 | 80429995 |
16 | 1421425107 |
17 | 32032166721 |
18 | 887240799013 |
19 | 28935423830217 |
20 | 1147385224061533 |
21 | 56743981461830039 |
[1,1,1,1,1,7,21,47,193,927,6473,56977,532817, 5726035,80429995,1421425107,32032166721, 887240799013,28935423830217,1147385224061533, 56743981461830039] |