n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 25 |
6 | 68 |
7 | 193 |
8 | 565 |
9 | 1688 |
10 | 5136 |
11 | 15854 |
12 | 49517 |
13 | 156191 |
14 | 496836 |
15 | 1591924 |
16 | 5133091 |
17 | 16643856 |
18 | 54234349 |
19 | 177505376 |
20 | 583272256 |
21 | 1923482331 |
22 | 6363842492 |
23 | 21117432227 |
24 | 70265970878 |
25 | 234388421515 |
26 | 783664894313 |
27 | 2625748635300 |
[1,1,2,4,10,25,68,193,565,1688,5136,15854,49517, 156191,496836,1591924,5133091,16643856,54234349, 177505376,583272256,1923482331,6363842492, 21117432227,70265970878,234388421515,783664894313, 2625748635300] |