Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
1 | 4 |
2 | 20 |
3 | 76 |
4 | 260 |
5 | 840 |
6 | 2616 |
7 | 7940 |
8 | 23644 |
9 | 69380 |
10 | 201220 |
11 | 578064 |
12 | 1647600 |
13 | 4664836 |
14 | 13132580 |
15 | 36789820 |
16 | 102621956 |
17 | 285174360 |
18 | 789810984 |
19 | 2180889860 |
20 | 6005842540 |
21 | 16498958324 |
22 | 45225010180 |
23 | 123715684896 |
24 | 337806904800 |
25 | 920819997700 |
[4,20,76,260,840,2616,7940,23644,69380,201220, 578064,1647600,4664836,13132580,36789820, 102621956,285174360,789810984,2180889860, 6005842540,16498958324,45225010180,123715684896, 337806904800,920819997700] |