n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 57 |
4 | 264 |
5 | 1261 |
6 | 6141 |
7 | 30276 |
8 | 150853 |
9 | 758145 |
10 | 3836896 |
11 | 19534086 |
12 | 99957904 |
13 | 513756551 |
14 | 2650822585 |
15 | 13724435509 |
16 | 71275344341 |
17 | 371177285715 |
18 | 1937791196448 |
19 | 10139548682524 |
20 | 53165765660928 |
21 | 279301910804937 |
[1,3,12,57,264,1261,6141,30276,150853,758145, 3836896,19534086,99957904,513756551,2650822585, 13724435509,71275344341,371177285715, 1937791196448,10139548682524,53165765660928, 279301910804937] |