n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 22 |
4 | 112 |
5 | 580 |
6 | 2992 |
7 | 15448 |
8 | 79744 |
9 | 411664 |
10 | 2125120 |
11 | 10970464 |
12 | 56632576 |
13 | 292353088 |
14 | 1509207808 |
15 | 7790949760 |
16 | 40219045888 |
17 | 207621882112 |
18 | 1071801803776 |
19 | 5532938507776 |
20 | 28562564853760 |
[0,1,4,22,112,580,2992,15448,79744,411664,2125120, 10970464,56632576,292353088,1509207808,7790949760, 40219045888,207621882112,1071801803776, 5532938507776,28562564853760] |