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 | 7 |
4 | 30 |
5 | 105 |
6 | 336 |
7 | 1001 |
8 | 2841 |
9 | 7733 |
10 | 20309 |
11 | 51720 |
12 | 128170 |
13 | 309980 |
14 | 733390 |
15 | 1700803 |
16 | 3872770 |
17 | 8670938 |
18 | 19113100 |
19 | 41523358 |
20 | 88995738 |
21 | 188335956 |
22 | 393837052 |
23 | 814361551 |
24 | 1666112092 |
25 | 3374591118 |
26 | 6770019118 |
27 | 13459008137 |
[1,0,1,7,30,105,336,1001,2841,7733,20309,51720, 128170,309980,733390,1700803,3872770,8670938, 19113100,41523358,88995738,188335956,393837052, 814361551,1666112092,3374591118,6770019118, 13459008137] |