n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 18 |
4 | 96 |
5 | 580 |
6 | 3852 |
7 | 27678 |
8 | 212224 |
9 | 1722312 |
10 | 14685140 |
11 | 130892938 |
12 | 1214128032 |
13 | 11680325020 |
14 | 116190588780 |
15 | 1192226810430 |
16 | 12591401841664 |
17 | 136623457948048 |
18 | 1520550097621092 |
19 | 17333459861354594 |
20 | 202126167076086240 |
21 | 2408357155115241204 |
22 | 29290914934010144140 |
23 | 363292802351275750334 |
24 | 4591181653408243417344 |
25 | 59074675546178377971800 |
26 | 773355406301039296118644 |
27 | 10293777784435208488738938 |
[1,1,4,18,96,580,3852,27678,212224,1722312, 14685140,130892938,1214128032,11680325020, 116190588780,1192226810430,12591401841664, 136623457948048,1520550097621092, 17333459861354594,202126167076086240, 2408357155115241204,29290914934010144140, 363292802351275750334,4591181653408243417344, 59074675546178377971800,773355406301039296118644, 10293777784435208488738938] |