n | a(n) |
---|---|
1 | 2 |
2 | 52 |
3 | 3132 |
4 | 31104 |
5 | 347934 |
6 | 1893780 |
7 | 9714968 |
8 | 35251360 |
9 | 119069850 |
10 | 331355220 |
11 | 869135892 |
12 | 2019732192 |
13 | 4480392182 |
14 | 9156814324 |
15 | 18041010864 |
16 | 33514806720 |
17 | 60460359858 |
18 | 104364198900 |
19 | 175893704300 |
20 | 286474229440 |
21 | 457427541582 |
[2,52,3132,31104,347934,1893780,9714968,35251360, 119069850,331355220,869135892,2019732192, 4480392182,9156814324,18041010864,33514806720, 60460359858,104364198900,175893704300, 286474229440,457427541582] |