n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 16 |
5 | 84 |
6 | 536 |
7 | 3912 |
8 | 32256 |
9 | 297072 |
10 | 3026112 |
11 | 33798720 |
12 | 410826624 |
13 | 5399704320 |
14 | 76317546240 |
15 | 1154312486400 |
16 | 18604815528960 |
17 | 318348065548800 |
18 | 5763746405053440 |
19 | 110086912964367360 |
20 | 2212209395234979840 |
21 | 46657233031296706560 |
22 | 1030510550216174469120 |
[1,1,2,4,16,84,536,3912,32256,297072,3026112, 33798720,410826624,5399704320,76317546240, 1154312486400,18604815528960,318348065548800, 5763746405053440,110086912964367360, 2212209395234979840,46657233031296706560, 1030510550216174469120] |