n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 28 |
5 | 119 |
6 | 483 |
7 | 1911 |
8 | 7448 |
9 | 28764 |
10 | 110466 |
11 | 422807 |
12 | 1615152 |
13 | 6163885 |
14 | 23514855 |
15 | 89714835 |
16 | 342411120 |
17 | 1307613480 |
18 | 4997082510 |
19 | 19111589280 |
20 | 73154916744 |
21 | 280265589198 |
22 | 1074685552094 |
23 | 4124573481446 |
24 | 15843809385168 |
25 | 60914041121640 |
[1,6,28,119,483,1911,7448,28764,110466,422807, 1615152,6163885,23514855,89714835,342411120, 1307613480,4997082510,19111589280,73154916744, 280265589198,1074685552094,4124573481446, 15843809385168,60914041121640] |