n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 25 |
5 | 132 |
6 | 838 |
7 | 6209 |
8 | 52592 |
9 | 501238 |
10 | 5308295 |
11 | 61839954 |
12 | 785915626 |
13 | 10820482467 |
14 | 160436371306 |
15 | 2548722840218 |
16 | 43188812459297 |
17 | 777586865332600 |
18 | 14823480294719570 |
19 | 298285781617278681 |
20 | 6318170247815155180 |
21 | 140520406400556170514 |
22 | 3274091838364580459623 |
[1,1,2,6,25,132,838,6209,52592,501238,5308295, 61839954,785915626,10820482467,160436371306, 2548722840218,43188812459297,777586865332600, 14823480294719570,298285781617278681, 6318170247815155180,140520406400556170514, 3274091838364580459623] |