n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 36 |
6 | 181 |
7 | 848 |
8 | 3865 |
9 | 23824 |
10 | 140521 |
11 | 871872 |
12 | 6324517 |
13 | 44942912 |
14 | 344747677 |
15 | 2860930816 |
16 | 23853473329 |
17 | 213856723200 |
18 | 1996865965009 |
19 | 19099352929280 |
20 | 193406280000061 |
21 | 2010469524579328 |
22 | 21615227339380357 |
23 | 242177953175506944 |
[1,1,1,4,13,36,181,848,3865,23824,140521,871872, 6324517,44942912,344747677,2860930816,23853473329, 213856723200,1996865965009,19099352929280, 193406280000061,2010469524579328, 21615227339380357,242177953175506944] |