n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 17 |
3 | 54 |
4 | 145 |
5 | 368 |
6 | 945 |
7 | 2530 |
8 | 7073 |
9 | 20412 |
10 | 60049 |
11 | 178478 |
12 | 533169 |
13 | 1596520 |
14 | 4785713 |
15 | 14352282 |
16 | 43050817 |
17 | 129145076 |
18 | 387426321 |
19 | 1162268326 |
20 | 3486792401 |
21 | 10460362464 |
22 | 31381070257 |
23 | 94143190994 |
24 | 282429550305 |
25 | 847288625068 |
[1,4,17,54,145,368,945,2530,7073,20412,60049, 178478,533169,1596520,4785713,14352282,43050817, 129145076,387426321,1162268326,3486792401, 10460362464,31381070257,94143190994,282429550305, 847288625068] |