n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 23 |
6 | 63 |
7 | 155 |
8 | 448 |
9 | 1152 |
10 | 3452 |
11 | 9158 |
12 | 28178 |
13 | 76539 |
14 | 240370 |
15 | 665129 |
16 | 2123439 |
17 | 5964691 |
18 | 19302316 |
19 | 54898416 |
20 | 179696557 |
[1,1,2,4,10,23,63,155,448,1152,3452,9158,28178, 76539,240370,665129,2123439,5964691,19302316, 54898416,179696557] |