n | a(n) |
---|---|
1 | 0 |
2 | 4 |
3 | 8 |
4 | 15 |
5 | 31 |
6 | 92 |
7 | 264 |
8 | 784 |
9 | 2378 |
10 | 7342 |
11 | 22596 |
12 | 69617 |
13 | 214983 |
14 | 664217 |
15 | 2052307 |
16 | 6342935 |
17 | 19606074 |
18 | 60603932 |
19 | 187335711 |
20 | 579091828 |
21 | 1790098137 |
22 | 5533594957 |
23 | 17105617402 |
24 | 52877461311 |
25 | 163456660240 |
26 | 505283076436 |
27 | 1561949355656 |
[0,4,8,15,31,92,264,784,2378,7342,22596,69617, 214983,664217,2052307,6342935,19606074,60603932, 187335711,579091828,1790098137,5533594957, 17105617402,52877461311,163456660240,505283076436, 1561949355656] |