n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 128 |
5 | 1090 |
6 | 11232 |
7 | 134806 |
8 | 1849696 |
9 | 28550538 |
10 | 489656720 |
11 | 9237631150 |
12 | 190115847792 |
13 | 4238752713442 |
14 | 101775333547552 |
15 | 2618244556598310 |
16 | 71846664091504064 |
17 | 2094748778352174202 |
18 | 64666725024407102064 |
19 | 2107224874854168508126 |
20 | 72279858915240296971600 |
[1,4,18,128,1090,11232,134806,1849696,28550538, 489656720,9237631150,190115847792,4238752713442, 101775333547552,2618244556598310, 71846664091504064,2094748778352174202, 64666725024407102064,2107224874854168508126, 72279858915240296971600] |