n | a(n) |
---|---|
1 | 4 |
2 | 16 |
3 | 60 |
4 | 228 |
5 | 852 |
6 | 3180 |
7 | 11796 |
8 | 43644 |
9 | 160980 |
10 | 592572 |
11 | 2177268 |
12 | 7988700 |
13 | 29277204 |
14 | 107195196 |
15 | 392179380 |
16 | 1433907228 |
17 | 5240022612 |
18 | 19140884220 |
19 | 69894090996 |
20 | 255150047964 |
21 | 931214323860 |
22 | 3397977981372 |
23 | 12397189043508 |
24 | 45224087388060 |
[4,16,60,228,852,3180,11796,43644,160980,592572, 2177268,7988700,29277204,107195196,392179380, 1433907228,5240022612,19140884220,69894090996, 255150047964,931214323860,3397977981372, 12397189043508,45224087388060] |