n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 8 |
4 | 42 |
5 | 264 |
6 | 1916 |
7 | 15744 |
8 | 144546 |
9 | 1467544 |
10 | 16335972 |
11 | 197916768 |
12 | 2593286692 |
13 | 36547123728 |
14 | 551308006392 |
15 | 8863973173120 |
16 | 151328667184530 |
17 | 2734113089546040 |
18 | 52120618871199060 |
19 | 1045503182929422240 |
20 | 22014065919151444140 |
21 | 485475449631284066160 |
[1,2,8,42,264,1916,15744,144546,1467544,16335972, 197916768,2593286692,36547123728,551308006392, 8863973173120,151328667184530,2734113089546040, 52120618871199060,1045503182929422240, 22014065919151444140,485475449631284066160] |