n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 38 |
3 | 328 |
4 | 2686 |
5 | 21224 |
6 | 163982 |
7 | 1249784 |
8 | 9447102 |
9 | 71056840 |
10 | 532854638 |
11 | 3988597144 |
12 | 29822927134 |
13 | 222836912744 |
14 | 1664351910350 |
15 | 12427793513528 |
16 | 92784673372542 |
17 | 692656225953544 |
18 | 5170521713987630 |
19 | 38595421782328024 |
20 | 288089831076277726 |
21 | 2150375933904641960 |
[0,4,38,328,2686,21224,163982,1249784,9447102, 71056840,532854638,3988597144,29822927134, 222836912744,1664351910350,12427793513528, 92784673372542,692656225953544,5170521713987630, 38595421782328024,288089831076277726, 2150375933904641960] |