n | a(n) |
---|---|
1 | 2 |
2 | 1 |
3 | 3 |
4 | 6 |
5 | 12 |
6 | 33 |
7 | 84 |
8 | 204 |
9 | 507 |
10 | 1410 |
11 | 3828 |
12 | 10185 |
13 | 27048 |
14 | 78720 |
15 | 222051 |
16 | 613770 |
17 | 1704360 |
18 | 4978050 |
19 | 14312460 |
20 | 40615440 |
21 | 115306545 |
22 | 341021994 |
23 | 994082808 |
24 | 2865120612 |
25 | 8271370236 |
26 | 24556630128 |
27 | 72215184450 |
28 | 210645965832 |
29 | 614238371328 |
30 | 1836536385786 |
[2,1,3,6,12,33,84,204,507,1410,3828,10185,27048, 78720,222051,613770,1704360,4978050,14312460, 40615440,115306545,341021994,994082808,2865120612, 8271370236,24556630128,72215184450,210645965832, 614238371328,1836536385786] |