n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 21 |
4 | 136 |
5 | 1045 |
6 | 9276 |
7 | 93289 |
8 | 1047376 |
9 | 12975561 |
10 | 175721140 |
11 | 2581284541 |
12 | 40864292184 |
13 | 693347907421 |
14 | 12548540320876 |
15 | 241253367679185 |
16 | 4909234733857696 |
17 | 105394372192969489 |
18 | 2380337795595885156 |
19 | 56410454014314490981 |
20 | 1399496554158060983080 |
[0,1,4,21,136,1045,9276,93289,1047376,12975561, 175721140,2581284541,40864292184,693347907421, 12548540320876,241253367679185,4909234733857696, 105394372192969489,2380337795595885156, 56410454014314490981,1399496554158060983080] |