n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 28 |
4 | 272 |
5 | 3369 |
6 | 50816 |
7 | 903856 |
8 | 18522624 |
9 | 429746905 |
10 | 11135257600 |
11 | 318719062236 |
12 | 9987013488640 |
13 | 340037795872369 |
14 | 12500401969233920 |
15 | 493467700789897408 |
16 | 20819865970795610112 |
17 | 934939160745193002321 |
18 | 44523294861684890664960 |
[1,1,4,28,272,3369,50816,903856,18522624, 429746905,11135257600,318719062236,9987013488640, 340037795872369,12500401969233920, 493467700789897408,20819865970795610112, 934939160745193002321,44523294861684890664960] |