n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 18 |
3 | 66 |
4 | 280 |
5 | 1420 |
6 | 8544 |
7 | 59836 |
8 | 478720 |
9 | 4308516 |
10 | 43085200 |
11 | 473937244 |
12 | 5687246976 |
13 | 73934210740 |
14 | 1035078950416 |
15 | 15526184256300 |
16 | 248418948100864 |
17 | 4223122117714756 |
18 | 76016198118865680 |
19 | 1444307764258447996 |
[1,5,18,66,280,1420,8544,59836,478720,4308516, 43085200,473937244,5687246976,73934210740, 1035078950416,15526184256300,248418948100864, 4223122117714756,76016198118865680, 1444307764258447996] |