n | a(n) |
---|---|
1 | 4 |
2 | 12 |
3 | 30 |
4 | 96 |
5 | 286 |
6 | 848 |
7 | 2620 |
8 | 7964 |
9 | 24332 |
10 | 74740 |
11 | 228968 |
12 | 702656 |
13 | 2157520 |
14 | 6622672 |
15 | 20336808 |
16 | 62452688 |
17 | 191784960 |
18 | 588994592 |
19 | 1808876976 |
20 | 5555328528 |
21 | 17061469024 |
22 | 52399035584 |
23 | 160927919584 |
24 | 494243002176 |
25 | 1517923151392 |
26 | 4661861611200 |
[4,12,30,96,286,848,2620,7964,24332,74740,228968, 702656,2157520,6622672,20336808,62452688, 191784960,588994592,1808876976,5555328528, 17061469024,52399035584,160927919584,494243002176, 1517923151392,4661861611200] |