Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 18 |
3 | 76 |
4 | 320 |
5 | 1360 |
6 | 5832 |
7 | 25200 |
8 | 109568 |
9 | 478784 |
10 | 2100512 |
11 | 9244352 |
12 | 40784896 |
13 | 180284672 |
14 | 798121088 |
15 | 3537391360 |
16 | 15692333056 |
17 | 69661541376 |
18 | 309407486464 |
19 | 1374824795136 |
20 | 6110847909888 |
21 | 27168232722432 |
22 | 120809925167104 |
[0,4,18,76,320,1360,5832,25200,109568,478784, 2100512,9244352,40784896,180284672,798121088, 3537391360,15692333056,69661541376,309407486464, 1374824795136,6110847909888,27168232722432, 120809925167104] |