n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 14 |
4 | 45 |
5 | 374 |
6 | 2560 |
7 | 19172 |
8 | 236145 |
9 | 2051870 |
10 | 26635476 |
11 | 363996632 |
12 | 4321714980 |
13 | 71766211464 |
14 | 1127739971072 |
15 | 17315941180540 |
16 | 312700502653721 |
17 | 6094341068758734 |
18 | 110314386554987020 |
19 | 2097555771605899856 |
20 | 48644259993732339024 |
21 | 1028684380017105071404 |
[1,1,3,14,45,374,2560,19172,236145,2051870, 26635476,363996632,4321714980,71766211464, 1127739971072,17315941180540,312700502653721, 6094341068758734,110314386554987020, 2097555771605899856,48644259993732339024, 1028684380017105071404] |