n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 6 |
4 | 34 |
5 | 270 |
6 | 3415 |
7 | 31230 |
8 | 681026 |
9 | 6949920 |
10 | 230637870 |
11 | 2546120514 |
12 | 119281951006 |
13 | 1394371349490 |
14 | 87612425583018 |
15 | 1069010047029672 |
16 | 86763885548985810 |
17 | 1094149501538197236 |
18 | 111443560982774811439 |
19 | 1442387644419293694144 |
20 | 180179254059921915232864 |
[1,0,1,6,34,270,3415,31230,681026,6949920, 230637870,2546120514,119281951006,1394371349490, 87612425583018,1069010047029672,86763885548985810, 1094149501538197236,111443560982774811439, 1442387644419293694144,180179254059921915232864] |