n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 22 |
6 | 90 |
7 | 392 |
8 | 1775 |
9 | 8252 |
10 | 39114 |
11 | 188220 |
12 | 916920 |
13 | 4512880 |
14 | 22406488 |
15 | 112092264 |
16 | 564474555 |
17 | 2859167178 |
18 | 14557198500 |
19 | 74459570756 |
20 | 382441401734 |
21 | 1971683051152 |
22 | 10199692593804 |
23 | 52927874586704 |
24 | 275432533945182 |
[1,1,2,6,22,90,392,1775,8252,39114,188220,916920, 4512880,22406488,112092264,564474555,2859167178, 14557198500,74459570756,382441401734, 1971683051152,10199692593804,52927874586704, 275432533945182] |