n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 16 |
5 | 80 |
6 | 467 |
7 | 3196 |
8 | 25042 |
9 | 221208 |
10 | 2175216 |
11 | 23564850 |
12 | 278850730 |
13 | 3578584368 |
14 | 49503750432 |
15 | 734305631412 |
16 | 11626505830701 |
17 | 195712848150140 |
18 | 3490212458677514 |
19 | 65732334638426516 |
20 | 1303691303662125905 |
[1,0,1,4,16,80,467,3196,25042,221208,2175216, 23564850,278850730,3578584368,49503750432, 734305631412,11626505830701,195712848150140, 3490212458677514,65732334638426516, 1303691303662125905] |