n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 6 |
3 | 52 |
4 | 409 |
5 | 3208 |
6 | 25484 |
7 | 205452 |
8 | 1679332 |
9 | 13894848 |
10 | 116193246 |
11 | 980658172 |
12 | 8343605534 |
13 | 71492410640 |
14 | 616418176920 |
15 | 5344364518140 |
16 | 46565472754044 |
17 | 407529832131712 |
18 | 3580911446989368 |
19 | 31579384975219920 |
20 | 279414033129153065 |
21 | 2479725948121016040 |
[0,0,6,52,409,3208,25484,205452,1679332,13894848, 116193246,980658172,8343605534,71492410640, 616418176920,5344364518140,46565472754044, 407529832131712,3580911446989368, 31579384975219920,279414033129153065, 2479725948121016040] |