n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 46 |
4 | 144 |
5 | 436 |
6 | 1287 |
7 | 3724 |
8 | 10603 |
9 | 29788 |
10 | 82748 |
11 | 227658 |
12 | 621122 |
13 | 1682252 |
14 | 4526845 |
15 | 12111512 |
16 | 32237253 |
17 | 85407188 |
18 | 225318042 |
19 | 592141478 |
20 | 1550688932 |
21 | 4047787844 |
22 | 10534503523 |
23 | 27340763556 |
24 | 70777265551 |
25 | 182785072876 |
[1,4,14,46,144,436,1287,3724,10603,29788,82748, 227658,621122,1682252,4526845,12111512,32237253, 85407188,225318042,592141478,1550688932, 4047787844,10534503523,27340763556,70777265551, 182785072876] |