n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 196 |
4 | 1416 |
5 | 10860 |
6 | 87392 |
7 | 727188 |
8 | 6196212 |
9 | 53783336 |
10 | 474011756 |
11 | 4231158016 |
12 | 38174676188 |
13 | 347566170384 |
14 | 3189295781780 |
15 | 29465038957708 |
16 | 273851282010308 |
17 | 2558703740102840 |
18 | 24019990008557160 |
19 | 226444571054525156 |
20 | 2142925363606256584 |
21 | 20349477565111498148 |
[1,4,28,196,1416,10860,87392,727188,6196212, 53783336,474011756,4231158016,38174676188, 347566170384,3189295781780,29465038957708, 273851282010308,2558703740102840, 24019990008557160,226444571054525156, 2142925363606256584,20349477565111498148] |