n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 6 |
4 | 20 |
5 | 60 |
6 | 291 |
7 | 1310 |
8 | 6975 |
9 | 37746 |
10 | 215602 |
11 | 1262874 |
12 | 7611156 |
13 | 46814132 |
14 | 293447817 |
15 | 1868710728 |
16 | 12068905911 |
17 | 78913940784 |
18 | 521709872895 |
19 | 3483289035186 |
20 | 23464708686960 |
21 | 159346213738020 |
22 | 1090073011199451 |
23 | 7507285094455566 |
24 | 52021636161126702 |
[1,3,6,20,60,291,1310,6975,37746,215602,1262874, 7611156,46814132,293447817,1868710728,12068905911, 78913940784,521709872895,3483289035186, 23464708686960,159346213738020,1090073011199451, 7507285094455566,52021636161126702] |