n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 10 |
4 | 38 |
5 | 127 |
6 | 494 |
7 | 1804 |
8 | 7250 |
9 | 27768 |
10 | 113603 |
11 | 448933 |
12 | 1858458 |
13 | 7499923 |
14 | 31317733 |
15 | 128292015 |
16 | 539273259 |
17 | 2233843666 |
18 | 9439572100 |
19 | 39437413808 |
20 | 167371595700 |
21 | 703994615004 |
22 | 2998532854976 |
23 | 12681319659582 |
24 | 54179682762863 |
25 | 230166423231860 |
26 | 985971775884988 |
27 | 4204379913759209 |
[1,1,4,10,38,127,494,1804,7250,27768,113603, 448933,1858458,7499923,31317733,128292015, 539273259,2233843666,9439572100,39437413808, 167371595700,703994615004,2998532854976, 12681319659582,54179682762863,230166423231860, 985971775884988,4204379913759209] |