n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 21 |
4 | 144 |
5 | 1205 |
6 | 11908 |
7 | 135597 |
8 | 1745488 |
9 | 25045821 |
10 | 396249564 |
11 | 6850289765 |
12 | 128438323720 |
13 | 2595394603269 |
14 | 56224162108468 |
15 | 1299717221807229 |
16 | 31931915643021504 |
17 | 830816659779428525 |
18 | 22820190255069409804 |
19 | 659845945466402034165 |
20 | 20034230527927369097848 |
21 | 637252918691725377815349 |
[1,1,4,21,144,1205,11908,135597,1745488,25045821, 396249564,6850289765,128438323720,2595394603269, 56224162108468,1299717221807229,31931915643021504, 830816659779428525,22820190255069409804, 659845945466402034165,20034230527927369097848, 637252918691725377815349] |