n | a(n) |
---|---|
1 | 21 |
2 | 90 |
3 | 420 |
4 | 1992 |
5 | 9552 |
6 | 45984 |
7 | 221760 |
8 | 1070208 |
9 | 5166336 |
10 | 24943104 |
11 | 120431616 |
12 | 581486592 |
13 | 2807648256 |
14 | 13556490240 |
15 | 65456455680 |
16 | 316051587072 |
17 | 1526031777792 |
18 | 7368332673024 |
19 | 35577456230400 |
20 | 171783152467968 |
21 | 829442428502016 |
[21,90,420,1992,9552,45984,221760,1070208,5166336, 24943104,120431616,581486592,2807648256, 13556490240,65456455680,316051587072, 1526031777792,7368332673024,35577456230400, 171783152467968,829442428502016] |