n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 28 |
6 | 84 |
7 | 264 |
8 | 860 |
9 | 2880 |
10 | 9862 |
11 | 34392 |
12 | 121770 |
13 | 436688 |
14 | 1583146 |
15 | 5793216 |
16 | 21370806 |
17 | 79391536 |
18 | 296760222 |
19 | 1115327844 |
20 | 4212125662 |
21 | 15976390684 |
22 | 60833679424 |
23 | 232452408632 |
24 | 891060970152 |
25 | 3425639505624 |
26 | 13204738280326 |
27 | 51024408662932 |
28 | 197607503526934 |
[0,1,2,4,10,28,84,264,860,2880,9862,34392,121770, 436688,1583146,5793216,21370806,79391536, 296760222,1115327844,4212125662,15976390684, 60833679424,232452408632,891060970152, 3425639505624,13204738280326,51024408662932, 197607503526934] |