n | a(n) |
---|---|
2 | 1 |
3 | 7 |
4 | 37 |
5 | 178 |
6 | 825 |
7 | 3774 |
8 | 17250 |
9 | 79326 |
10 | 368516 |
11 | 1733597 |
12 | 8268603 |
13 | 40003178 |
14 | 196273837 |
15 | 976066486 |
16 | 4915503146 |
17 | 25042730042 |
18 | 128927697340 |
19 | 670023585820 |
20 | 3511276691660 |
21 | 18537816521102 |
22 | 98514404946264 |
23 | 526575421631986 |
[1,7,37,178,825,3774,17250,79326,368516,1733597, 8268603,40003178,196273837,976066486,4915503146, 25042730042,128927697340,670023585820, 3511276691660,18537816521102,98514404946264, 526575421631986] |