Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 7 |
6 | 20 |
7 | 49 |
8 | 175 |
9 | 323 |
10 | 1085 |
11 | 2290 |
12 | 6489 |
13 | 15751 |
14 | 41749 |
15 | 105514 |
16 | 276079 |
17 | 706396 |
18 | 1825615 |
19 | 4714184 |
20 | 12103729 |
21 | 31297188 |
22 | 80431077 |
23 | 207561706 |
24 | 534335127 |
25 | 1377615603 |
26 | 3548250067 |
27 | 9145959294 |
28 | 23561913471 |
29 | 60719538527 |
30 | 156456169973 |
[1,0,1,1,7,20,49,175,323,1085,2290,6489,15751, 41749,105514,276079,706396,1825615,4714184, 12103729,31297188,80431077,207561706,534335127, 1377615603,3548250067,9145959294,23561913471, 60719538527,156456169973] |