n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 6 |
5 | 19 |
6 | 33 |
7 | 98 |
8 | 180 |
9 | 526 |
10 | 990 |
11 | 2887 |
12 | 5502 |
13 | 16073 |
14 | 30863 |
15 | 90386 |
16 | 174456 |
17 | 512128 |
18 | 992304 |
19 | 2918954 |
20 | 5673140 |
21 | 16716998 |
22 | 32571858 |
23 | 96119927 |
24 | 187675644 |
25 | 554524660 |
26 | 1084649644 |
27 | 3208254571 |
28 | 6284986554 |
29 | 18607536319 |
30 | 36501029265 |
[1,1,4,6,19,33,98,180,526,990,2887,5502,16073, 30863,90386,174456,512128,992304,2918954,5673140, 16716998,32571858,96119927,187675644,554524660, 1084649644,3208254571,6284986554,18607536319, 36501029265] |