n | a(n) |
---|---|
1 | 4 |
2 | 13 |
3 | 20 |
4 | 45 |
5 | 147 |
6 | 506 |
7 | 1561 |
8 | 5017 |
9 | 16429 |
10 | 53365 |
11 | 172859 |
12 | 562276 |
13 | 1828820 |
14 | 5943264 |
15 | 19318649 |
16 | 62811656 |
17 | 204197935 |
18 | 663816782 |
19 | 2158064264 |
20 | 7015860029 |
21 | 22808258862 |
22 | 74148897744 |
23 | 241056311862 |
24 | 783667226084 |
25 | 2547678766746 |
26 | 8282432122501 |
[4,13,20,45,147,506,1561,5017,16429,53365,172859, 562276,1828820,5943264,19318649,62811656, 204197935,663816782,2158064264,7015860029, 22808258862,74148897744,241056311862,783667226084, 2547678766746,8282432122501] |