n | a(n) |
---|---|
1 | 4 |
2 | 14 |
3 | 40 |
4 | 147 |
5 | 457 |
6 | 1554 |
7 | 5370 |
8 | 17678 |
9 | 58836 |
10 | 199055 |
11 | 666719 |
12 | 2226571 |
13 | 7472355 |
14 | 25062544 |
15 | 83919602 |
16 | 281223942 |
17 | 942759343 |
18 | 3159073709 |
19 | 10585785571 |
20 | 35477873281 |
21 | 118895583561 |
22 | 398433388350 |
23 | 1335248565663 |
24 | 4474760498199 |
[4,14,40,147,457,1554,5370,17678,58836,199055, 666719,2226571,7472355,25062544,83919602, 281223942,942759343,3159073709,10585785571, 35477873281,118895583561,398433388350, 1335248565663,4474760498199] |