n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 20 |
3 | 212 |
4 | 1768 |
5 | 13672 |
6 | 102012 |
7 | 745404 |
8 | 5374160 |
9 | 38400464 |
10 | 272709604 |
11 | 1928498596 |
12 | 13597146552 |
13 | 95668307256 |
14 | 672119557196 |
15 | 4717043931788 |
16 | 33080342678944 |
17 | 231867574534048 |
18 | 1624598900644788 |
19 | 11379821699044980 |
[0,0,20,212,1768,13672,102012,745404,5374160, 38400464,272709604,1928498596,13597146552, 95668307256,672119557196,4717043931788, 33080342678944,231867574534048,1624598900644788, 11379821699044980] |