Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 0 |
4 | 3 |
5 | 5 |
6 | 12 |
7 | 54 |
8 | 426 |
9 | 2334 |
10 | 23280 |
11 | 152820 |
12 | 1939740 |
13 | 14564760 |
14 | 222925920 |
15 | 1890254100 |
16 | 33899743010 |
17 | 320743643010 |
18 | 6597891367200 |
19 | 68944295861280 |
20 | 1600434039456630 |
21 | 18309730315533930 |
22 | 473501454337711800 |
[1,0,0,3,5,12,54,426,2334,23280,152820,1939740, 14564760,222925920,1890254100,33899743010, 320743643010,6597891367200,68944295861280, 1600434039456630,18309730315533930, 473501454337711800] |