n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 10 |
7 | 28 |
8 | 86 |
9 | 286 |
10 | 1019 |
11 | 3857 |
12 | 15418 |
13 | 64782 |
14 | 285041 |
15 | 1309355 |
16 | 6263085 |
17 | 31127475 |
18 | 160432093 |
19 | 856039863 |
20 | 4721638083 |
21 | 26883787141 |
22 | 157812750656 |
23 | 953995201996 |
24 | 5932516347277 |
25 | 37913110456751 |
26 | 248768719522450 |
27 | 1674488577654500 |
28 | 11553041105489900 |
[1,1,1,2,4,10,28,86,286,1019,3857,15418,64782, 285041,1309355,6263085,31127475,160432093, 856039863,4721638083,26883787141,157812750656, 953995201996,5932516347277,37913110456751, 248768719522450,1674488577654500, 11553041105489900] |