n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 28 |
4 | 1668 |
5 | 29092 |
6 | 252584 |
7 | 1441634 |
8 | 6222996 |
9 | 22004086 |
10 | 66972760 |
11 | 181332416 |
12 | 446905476 |
13 | 1019470032 |
14 | 2179712872 |
15 | 4410518630 |
16 | 8510498516 |
17 | 15756224370 |
18 | 28128603736 |
19 | 48622240660 |
20 | 81660504068 |
21 | 133643402268 |
22 | 213660267432 |
[0,0,28,1668,29092,252584,1441634,6222996, 22004086,66972760,181332416,446905476,1019470032, 2179712872,4410518630,8510498516,15756224370, 28128603736,48622240660,81660504068,133643402268, 213660267432] |