n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 17 |
3 | 80 |
4 | 401 |
5 | 2084 |
6 | 11073 |
7 | 59712 |
8 | 325441 |
9 | 1788004 |
10 | 9885457 |
11 | 54932176 |
12 | 306528145 |
13 | 1716461764 |
14 | 9640310017 |
15 | 54282691840 |
16 | 306337928449 |
17 | 1732172652868 |
18 | 9811489710737 |
19 | 55660919625680 |
20 | 316204733423121 |
21 | 1798580947651044 |
[1,4,17,80,401,2084,11073,59712,325441,1788004, 9885457,54932176,306528145,1716461764,9640310017, 54282691840,306337928449,1732172652868, 9811489710737,55660919625680,316204733423121, 1798580947651044] |