n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 42 |
6 | 216 |
7 | 1200 |
8 | 8664 |
9 | 66384 |
10 | 612264 |
11 | 5910024 |
12 | 66723384 |
13 | 776642664 |
14 | 10311400344 |
15 | 141065450904 |
16 | 2153769250584 |
17 | 33743736435864 |
18 | 583781959921944 |
19 | 10308436641381144 |
20 | 198863818304824344 |
21 | 3914117125411211544 |
22 | 83301822014343774744 |
23 | 1805447764831655109144 |
[1,1,2,4,12,42,216,1200,8664,66384,612264,5910024, 66723384,776642664,10311400344,141065450904, 2153769250584,33743736435864,583781959921944, 10308436641381144,198863818304824344, 3914117125411211544,83301822014343774744, 1805447764831655109144] |