n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 26 |
4 | 236 |
5 | 2756 |
6 | 39376 |
7 | 665464 |
8 | 12986416 |
9 | 287394416 |
10 | 7112021696 |
11 | 194607175136 |
12 | 5834321568064 |
13 | 190181750900416 |
14 | 6697115871398656 |
15 | 253362903806266496 |
16 | 10248299242094541056 |
17 | 441359565949128552704 |
18 | 20163160035504969573376 |
19 | 973917774772339989408256 |
[1,1,4,26,236,2756,39376,665464,12986416, 287394416,7112021696,194607175136,5834321568064, 190181750900416,6697115871398656, 253362903806266496,10248299242094541056, 441359565949128552704,20163160035504969573376, 973917774772339989408256] |