Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 140 |
4 | 620 |
5 | 2548 |
6 | 10276 |
7 | 40020 |
8 | 157948 |
9 | 627348 |
10 | 2499964 |
11 | 9980820 |
12 | 39884668 |
13 | 159461268 |
14 | 637689724 |
15 | 2550448020 |
[1,4,28,140,620,2548,10276,40020,157948,627348, 2499964,9980820,39884668,159461268,637689724, 2550448020] |