n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 20 |
6 | 66 |
7 | 212 |
8 | 715 |
9 | 2424 |
10 | 8398 |
11 | 29372 |
12 | 104006 |
13 | 371384 |
14 | 1337220 |
15 | 4847208 |
16 | 17678835 |
17 | 64821680 |
18 | 238819350 |
19 | 883629164 |
20 | 3282060210 |
21 | 12233125112 |
22 | 45741281820 |
23 | 171529777432 |
24 | 644952073662 |
25 | 2430973096720 |
26 | 9183676536076 |
[0,0,1,2,7,20,66,212,715,2424,8398,29372,104006, 371384,1337220,4847208,17678835,64821680, 238819350,883629164,3282060210,12233125112, 45741281820,171529777432,644952073662, 2430973096720,9183676536076] |