n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 26 |
4 | 219 |
5 | 2227 |
6 | 26438 |
7 | 359904 |
8 | 5555201 |
9 | 96383191 |
10 | 1864908541 |
11 | 39929905561 |
12 | 938897407239 |
13 | 24069888638463 |
14 | 668309231078015 |
15 | 19977542570492051 |
16 | 639571311256259372 |
17 | 21828488143257352752 |
18 | 791044181963746918758 |
19 | 30331001954496565907536 |
[1,1,4,26,219,2227,26438,359904,5555201,96383191, 1864908541,39929905561,938897407239, 24069888638463,668309231078015,19977542570492051, 639571311256259372,21828488143257352752, 791044181963746918758,30331001954496565907536] |