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n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 18 |
5 | 86 |
6 | 413 |
7 | 1975 |
8 | 9474 |
9 | 45415 |
10 | 217714 |
11 | 1043722 |
12 | 5003565 |
13 | 23986950 |
14 | 114992767 |
15 | 551272103 |
16 | 2642783040 |
17 | 12669427963 |
18 | 60736883262 |
19 | 291170919400 |
20 | 1395865242913 |
21 | 6691738929130 |
22 | 32080009243747 |
23 | 153790666966961 |
[0,1,4,18,86,413,1975,9474,45415,217714,1043722, 5003565,23986950,114992767,551272103,2642783040, 12669427963,60736883262,291170919400, 1395865242913,6691738929130,32080009243747, 153790666966961] |