n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 19 |
5 | 64 |
6 | 226 |
7 | 822 |
8 | 3061 |
9 | 11615 |
10 | 44746 |
11 | 174552 |
12 | 688122 |
13 | 2737153 |
14 | 10972066 |
15 | 44279234 |
16 | 179754362 |
17 | 733554695 |
18 | 3007551211 |
19 | 12382623614 |
20 | 51174497023 |
21 | 212218265661 |
22 | 882810782322 |
23 | 3682922292680 |
24 | 15404800893438 |
25 | 64590512696020 |
26 | 271425803359505 |
[1,1,2,6,19,64,226,822,3061,11615,44746,174552, 688122,2737153,10972066,44279234,179754362, 733554695,3007551211,12382623614,51174497023, 212218265661,882810782322,3682922292680, 15404800893438,64590512696020,271425803359505] |