n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 190 |
4 | 1216 |
5 | 7534 |
6 | 45928 |
7 | 277750 |
8 | 1673056 |
9 | 10058014 |
10 | 60407128 |
11 | 362619910 |
12 | 2176250896 |
13 | 13059099694 |
14 | 78359381128 |
15 | 470170635670 |
16 | 2821066860736 |
17 | 16926530304574 |
18 | 101559569247928 |
19 | 609358577749030 |
20 | 3656154953278576 |
[1,4,28,190,1216,7534,45928,277750,1673056, 10058014,60407128,362619910,2176250896, 13059099694,78359381128,470170635670, 2821066860736,16926530304574,101559569247928, 609358577749030,3656154953278576] |