n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 224 |
4 | 1948 |
5 | 17928 |
6 | 171776 |
7 | 1695872 |
8 | 17133436 |
9 | 176297668 |
10 | 1841222776 |
11 | 19467629120 |
12 | 207978652416 |
13 | 2241618514120 |
14 | 24345336854400 |
15 | 266168049520832 |
16 | 2927074607294300 |
17 | 32356419163487336 |
18 | 359330087240388828 |
19 | 4007079691584624576 |
[1,4,28,224,1948,17928,171776,1695872,17133436, 176297668,1841222776,19467629120,207978652416, 2241618514120,24345336854400,266168049520832, 2927074607294300,32356419163487336, 359330087240388828,4007079691584624576] |