n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 20 |
4 | 54 |
5 | 148 |
6 | 403 |
7 | 1096 |
8 | 2980 |
9 | 8103 |
10 | 22026 |
11 | 59874 |
12 | 162754 |
13 | 442413 |
14 | 1202604 |
15 | 3269017 |
16 | 8886110 |
17 | 24154952 |
18 | 65659969 |
19 | 178482300 |
20 | 485165195 |
21 | 1318815734 |
22 | 3584912846 |
23 | 9744803446 |
24 | 26489122129 |
25 | 72004899337 |
26 | 195729609428 |
27 | 532048240601 |
28 | 1446257064291 |
[1,2,7,20,54,148,403,1096,2980,8103,22026,59874, 162754,442413,1202604,3269017,8886110,24154952, 65659969,178482300,485165195,1318815734, 3584912846,9744803446,26489122129,72004899337, 195729609428,532048240601,1446257064291] |