n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 50 |
5 | 179 |
6 | 696 |
7 | 2619 |
8 | 10119 |
9 | 38867 |
10 | 150407 |
11 | 582065 |
12 | 2260367 |
13 | 8786919 |
14 | 34225256 |
15 | 133471650 |
16 | 521216494 |
17 | 2037608462 |
18 | 7974105052 |
19 | 31235316275 |
20 | 122457794193 |
21 | 480473181271 |
22 | 1886555402750 |
23 | 7412471695859 |
24 | 29142658077266 |
25 | 114643347181003 |
26 | 451237737215201 |
[1,1,4,13,50,179,696,2619,10119,38867,150407, 582065,2260367,8786919,34225256,133471650, 521216494,2037608462,7974105052,31235316275, 122457794193,480473181271,1886555402750, 7412471695859,29142658077266,114643347181003, 451237737215201] |