n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 204 |
4 | 1014 |
5 | 5716 |
6 | 31212 |
7 | 163480 |
8 | 826278 |
9 | 4320132 |
10 | 22096324 |
11 | 110079016 |
12 | 552324796 |
13 | 2721379144 |
14 | 13415146648 |
15 | 66143801648 |
16 | 321016593670 |
17 | 1549027853156 |
18 | 7506317522132 |
19 | 35931754574216 |
20 | 171790455469140 |
21 | 820584857999448 |
22 | 3893605676834920 |
23 | 18400781049682512 |
[1,6,30,204,1014,5716,31212,163480,826278,4320132, 22096324,110079016,552324796,2721379144, 13415146648,66143801648,321016593670, 1549027853156,7506317522132,35931754574216, 171790455469140,820584857999448,3893605676834920, 18400781049682512] |