n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 47 |
8 | 112 |
9 | 276 |
10 | 684 |
11 | 1713 |
12 | 4295 |
13 | 10797 |
14 | 27103 |
15 | 67985 |
16 | 170202 |
17 | 425420 |
18 | 1061324 |
19 | 2643451 |
20 | 6573241 |
21 | 16321357 |
22 | 40469502 |
23 | 100219208 |
24 | 247888403 |
25 | 612467226 |
26 | 1511670488 |
27 | 3727408256 |
28 | 9182341969 |
29 | 22600453960 |
30 | 55579530018 |
[1,1,1,2,4,9,20,47,112,276,684,1713,4295,10797, 27103,67985,170202,425420,1061324,2643451,6573241, 16321357,40469502,100219208,247888403,612467226, 1511670488,3727408256,9182341969,22600453960, 55579530018] |