Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 11 |
3 | 42 |
4 | 177 |
5 | 817 |
6 | 3981 |
7 | 20164 |
8 | 105027 |
9 | 558915 |
10 | 3025287 |
11 | 16603039 |
12 | 92169795 |
13 | 516644985 |
14 | 2920055107 |
15 | 16622691454 |
16 | 95220681081 |
17 | 548477688005 |
18 | 3174801937437 |
19 | 18457766735525 |
20 | 107734640321681 |
21 | 631075890235811 |
[1,4,11,42,177,817,3981,20164,105027,558915, 3025287,16603039,92169795,516644985,2920055107, 16622691454,95220681081,548477688005, 3174801937437,18457766735525,107734640321681, 631075890235811] |