n | a(n) |
---|---|
0 | 1 |
1 | 21 |
2 | 217 |
3 | 1498 |
4 | 7910 |
5 | 34566 |
6 | 131446 |
7 | 449732 |
8 | 1416513 |
9 | 4174765 |
10 | 11651717 |
11 | 31075422 |
12 | 79751854 |
13 | 198036146 |
14 | 477899790 |
15 | 1124785648 |
16 | 2589534248 |
17 | 5845989156 |
18 | 12968091584 |
19 | 28316428700 |
20 | 60953528230 |
21 | 129515454530 |
22 | 271955244610 |
23 | 564879359940 |
24 | 1161646929275 |
25 | 2366938010983 |
26 | 4781794056543 |
[1,21,217,1498,7910,34566,131446,449732,1416513, 4174765,11651717,31075422,79751854,198036146, 477899790,1124785648,2589534248,5845989156, 12968091584,28316428700,60953528230,129515454530, 271955244610,564879359940,1161646929275, 2366938010983,4781794056543] |