n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 27 |
5 | 110 |
6 | 428 |
7 | 1624 |
8 | 6069 |
9 | 22458 |
10 | 82555 |
11 | 302082 |
12 | 1101816 |
13 | 4009616 |
14 | 14567657 |
15 | 52865230 |
16 | 191684283 |
17 | 694609494 |
18 | 2515972324 |
19 | 9110338728 |
20 | 32981059485 |
21 | 119377761602 |
22 | 432046756571 |
23 | 1563510554986 |
24 | 5657752486512 |
25 | 20472344560800 |
[1,6,27,110,428,1624,6069,22458,82555,302082, 1101816,4009616,14567657,52865230,191684283, 694609494,2515972324,9110338728,32981059485, 119377761602,432046756571,1563510554986, 5657752486512,20472344560800] |