n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 12 |
4 | 70 |
5 | 492 |
6 | 4298 |
7 | 43894 |
8 | 514666 |
9 | 6830888 |
10 | 101473632 |
11 | 1664125944 |
12 | 29858266392 |
13 | 582481147440 |
14 | 12281821373040 |
15 | 278257595964576 |
16 | 6739505703156192 |
17 | 173785740554811264 |
18 | 4754455742416944000 |
19 | 137571331202872821504 |
20 | 4197696814883284962048 |
[1,3,12,70,492,4298,43894,514666,6830888, 101473632,1664125944,29858266392,582481147440, 12281821373040,278257595964576,6739505703156192, 173785740554811264,4754455742416944000, 137571331202872821504,4197696814883284962048] |