n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 21 |
6 | 51 |
7 | 126 |
8 | 316 |
9 | 800 |
10 | 2040 |
11 | 5230 |
12 | 13464 |
13 | 34773 |
14 | 90035 |
15 | 233590 |
16 | 607011 |
17 | 1579438 |
18 | 4114014 |
19 | 10725109 |
20 | 27979704 |
21 | 73035818 |
22 | 190737623 |
23 | 498320800 |
24 | 1302341411 |
25 | 3404552915 |
26 | 8902154847 |
27 | 23281653957 |
28 | 60897957049 |
29 | 159312797657 |
[1,1,2,4,9,21,51,126,316,800,2040,5230,13464, 34773,90035,233590,607011,1579438,4114014, 10725109,27979704,73035818,190737623,498320800, 1302341411,3404552915,8902154847,23281653957, 60897957049,159312797657] |