n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 59 |
6 | 252 |
7 | 1074 |
8 | 4633 |
9 | 19933 |
10 | 85732 |
11 | 368847 |
12 | 1586817 |
13 | 6826551 |
14 | 29368380 |
15 | 126345008 |
16 | 543545426 |
17 | 2338372742 |
18 | 10059853024 |
19 | 43278232785 |
20 | 186186164251 |
21 | 800986675100 |
22 | 3445904026216 |
23 | 14824534451888 |
24 | 63776245668953 |
[0,1,4,13,59,252,1074,4633,19933,85732,368847, 1586817,6826551,29368380,126345008,543545426, 2338372742,10059853024,43278232785,186186164251, 800986675100,3445904026216,14824534451888, 63776245668953] |