Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 5 |
4 | 10 |
5 | 26 |
6 | 85 |
7 | 170 |
8 | 500 |
9 | 1450 |
10 | 3172 |
11 | 7922 |
12 | 31031 |
13 | 54290 |
14 | 143140 |
15 | 483860 |
16 | 1105000 |
17 | 2550410 |
18 | 8923300 |
19 | 17494900 |
20 | 53353040 |
21 | 150655700 |
22 | 313727044 |
23 | 821223650 |
24 | 3291697500 |
25 | 5862907302 |
26 | 14736586180 |
27 | 48413209000 |
28 | 113026206800 |
[1,1,5,10,26,85,170,500,1450,3172,7922,31031, 54290,143140,483860,1105000,2550410,8923300, 17494900,53353040,150655700,313727044,821223650, 3291697500,5862907302,14736586180,48413209000, 113026206800] |