Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 2 |
5 | 6 |
6 | 20 |
7 | 69 |
8 | 246 |
9 | 894 |
10 | 3292 |
11 | 12242 |
12 | 45868 |
13 | 172884 |
14 | 654792 |
15 | 2489981 |
16 | 9500774 |
17 | 36356214 |
18 | 139471404 |
19 | 536217814 |
20 | 2065543012 |
21 | 7970227084 |
22 | 30801517624 |
23 | 119198827218 |
24 | 461863265660 |
25 | 1791626278060 |
26 | 6957151415832 |
27 | 27041349974436 |
28 | 105197526148312 |
29 | 409575623758440 |
30 | 1595836895778320 |
[0,0,0,1,2,6,20,69,246,894,3292,12242,45868, 172884,654792,2489981,9500774,36356214,139471404, 536217814,2065543012,7970227084,30801517624, 119198827218,461863265660,1791626278060, 6957151415832,27041349974436,105197526148312, 409575623758440,1595836895778320] |