n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 13 |
4 | 44 |
5 | 163 |
6 | 666 |
7 | 2985 |
8 | 14550 |
9 | 76497 |
10 | 430746 |
11 | 2582447 |
12 | 16403028 |
13 | 109918745 |
14 | 774289168 |
15 | 5715471605 |
16 | 44087879136 |
17 | 354521950931 |
18 | 2965359744446 |
19 | 25749723493073 |
20 | 231719153184018 |
21 | 2157494726318233 |
22 | 20753996174222510 |
23 | 205985762120971167 |
24 | 2106795754056142536 |
[1,4,13,44,163,666,2985,14550,76497,430746, 2582447,16403028,109918745,774289168,5715471605, 44087879136,354521950931,2965359744446, 25749723493073,231719153184018,2157494726318233, 20753996174222510,205985762120971167, 2106795754056142536] |