Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 7 |
5 | 15 |
6 | 90 |
7 | 301 |
8 | 1701 |
9 | 7770 |
10 | 42525 |
11 | 246730 |
12 | 1323652 |
13 | 9321312 |
14 | 49329280 |
15 | 408741333 |
16 | 2141764053 |
17 | 20415995028 |
18 | 106175395755 |
19 | 1144614626805 |
20 | 5917584964655 |
21 | 71187132291275 |
22 | 366282500870286 |
23 | 4864251308951100 |
24 | 24930204590758260 |
25 | 362262620784874680 |
[1,0,1,1,7,15,90,301,1701,7770,42525,246730, 1323652,9321312,49329280,408741333,2141764053, 20415995028,106175395755,1144614626805, 5917584964655,71187132291275,366282500870286, 4864251308951100,24930204590758260, 362262620784874680] |