n | a(n) |
---|---|
1 | 2 |
2 | 18 |
3 | 108 |
4 | 562 |
5 | 2724 |
6 | 12660 |
7 | 57240 |
8 | 253842 |
9 | 1109748 |
10 | 4798780 |
11 | 20572392 |
12 | 87580308 |
13 | 370706408 |
14 | 1561573032 |
15 | 6551178288 |
16 | 27387484242 |
17 | 114146434068 |
18 | 474476717292 |
19 | 1967642119368 |
20 | 8142727008732 |
21 | 33634295542968 |
22 | 138696447565272 |
23 | 571069686589008 |
24 | 2348087834494932 |
[2,18,108,562,2724,12660,57240,253842,1109748, 4798780,20572392,87580308,370706408,1561573032, 6551178288,27387484242,114146434068,474476717292, 1967642119368,8142727008732,33634295542968, 138696447565272,571069686589008,2348087834494932] |