n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 56 |
5 | 480 |
6 | 5094 |
7 | 60494 |
8 | 823528 |
9 | 12365424 |
10 | 206078880 |
11 | 3745686912 |
12 | 74083090872 |
13 | 1579529362944 |
14 | 36165466533000 |
15 | 884104045301640 |
16 | 22992315801392064 |
17 | 633547543117707648 |
18 | 18439576158792912192 |
19 | 565162707747635408448 |
20 | 18194047307015185486080 |
[1,1,2,9,56,480,5094,60494,823528,12365424, 206078880,3745686912,74083090872,1579529362944, 36165466533000,884104045301640,22992315801392064, 633547543117707648,18439576158792912192, 565162707747635408448,18194047307015185486080] |