n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 7 |
4 | 18 |
5 | 38 |
6 | 88 |
7 | 195 |
8 | 441 |
9 | 988 |
10 | 2223 |
11 | 4992 |
12 | 11220 |
13 | 25208 |
14 | 56645 |
15 | 127277 |
16 | 285992 |
17 | 642615 |
18 | 1443946 |
19 | 3244514 |
20 | 7290360 |
21 | 16381287 |
22 | 36808421 |
23 | 82707768 |
24 | 185842671 |
25 | 417584688 |
26 | 938304280 |
27 | 2108350576 |
28 | 4737420745 |
29 | 10644887785 |
30 | 23918845740 |
[1,1,4,7,18,38,88,195,441,988,2223,4992,11220, 25208,56645,127277,285992,642615,1443946,3244514, 7290360,16381287,36808421,82707768,185842671, 417584688,938304280,2108350576,4737420745, 10644887785,23918845740] |