n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 15 |
3 | 59 |
4 | 225 |
5 | 872 |
6 | 3375 |
7 | 13072 |
8 | 50625 |
9 | 196070 |
10 | 759375 |
11 | 2941047 |
12 | 11390625 |
13 | 44115701 |
14 | 170859375 |
15 | 661735514 |
16 | 2562890625 |
17 | 9926032709 |
18 | 38443359375 |
19 | 148890490632 |
20 | 576650390625 |
21 | 2233357359475 |
22 | 8649755859375 |
[1,4,15,59,225,872,3375,13072,50625,196070,759375, 2941047,11390625,44115701,170859375,661735514, 2562890625,9926032709,38443359375,148890490632, 576650390625,2233357359475,8649755859375] |