n | a(n) |
---|---|
1 | 1 |
2 | 12 |
3 | 66 |
4 | 426 |
5 | 2794 |
6 | 18838 |
7 | 127800 |
8 | 881008 |
9 | 6081086 |
10 | 42452472 |
11 | 296258332 |
12 | 2085263400 |
13 | 14662923954 |
14 | 103810065802 |
15 | 734016517080 |
16 | 5219300699654 |
17 | 37060739113354 |
18 | 264413563521598 |
19 | 1883784631395118 |
20 | 13476226807283384 |
[1,12,66,426,2794,18838,127800,881008,6081086, 42452472,296258332,2085263400,14662923954, 103810065802,734016517080,5219300699654, 37060739113354,264413563521598,1883784631395118, 13476226807283384] |