Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 80 |
4 | 310 |
5 | 1200 |
6 | 4650 |
7 | 18000 |
8 | 69690 |
9 | 269820 |
10 | 1044630 |
11 | 4044420 |
12 | 15658470 |
13 | 60623640 |
14 | 234711810 |
15 | 908715240 |
16 | 3518201250 |
17 | 13621143060 |
18 | 52735907790 |
19 | 204173464860 |
20 | 790482339630 |
21 | 3060448278480 |
22 | 11848896802170 |
23 | 45874441471680 |
[1,5,20,80,310,1200,4650,18000,69690,269820, 1044630,4044420,15658470,60623640,234711810, 908715240,3518201250,13621143060,52735907790, 204173464860,790482339630,3060448278480, 11848896802170,45874441471680] |