n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 13 |
3 | 36 |
4 | 97 |
5 | 268 |
6 | 765 |
7 | 2236 |
8 | 6625 |
9 | 19764 |
10 | 59149 |
11 | 177268 |
12 | 531585 |
13 | 1594492 |
14 | 4783165 |
15 | 14349132 |
16 | 43046977 |
17 | 129140452 |
18 | 387420813 |
19 | 1162261828 |
20 | 3486784801 |
21 | 10460353644 |
22 | 31381060093 |
23 | 94143179356 |
24 | 282429537057 |
25 | 847288610068 |
26 | 2541865829005 |
27 | 7625597485716 |
[1,4,13,36,97,268,765,2236,6625,19764,59149, 177268,531585,1594492,4783165,14349132,43046977, 129140452,387420813,1162261828,3486784801, 10460353644,31381060093,94143179356,282429537057, 847288610068,2541865829005,7625597485716] |