n | a(n) |
---|---|
2 | 2 |
3 | 6 |
4 | 24 |
5 | 114 |
6 | 528 |
7 | 2334 |
8 | 9528 |
9 | 36834 |
10 | 135918 |
11 | 484206 |
12 | 1678152 |
13 | 5694786 |
14 | 19007808 |
15 | 62625054 |
16 | 204215340 |
17 | 660445914 |
18 | 2121665016 |
19 | 6778399914 |
20 | 21557206332 |
21 | 68294432778 |
22 | 215651021484 |
23 | 679023425238 |
24 | 2132750062560 |
25 | 6684084844362 |
26 | 20907052386534 |
27 | 65279503654446 |
[2,6,24,114,528,2334,9528,36834,135918,484206, 1678152,5694786,19007808,62625054,204215340, 660445914,2121665016,6778399914,21557206332, 68294432778,215651021484,679023425238, 2132750062560,6684084844362,20907052386534, 65279503654446] |