n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 36 |
3 | 228 |
4 | 1540 |
5 | 8964 |
6 | 56292 |
7 | 316388 |
8 | 1857028 |
9 | 10301892 |
10 | 57884132 |
11 | 312915172 |
12 | 1720407492 |
13 | 9132560068 |
14 | 48898964964 |
15 | 256790538660 |
16 | 1350883911620 |
17 | 6992031608260 |
18 | 36296271612324 |
19 | 185785685287076 |
20 | 952221494828996 |
21 | 4831039856692356 |
22 | 24489621255994276 |
[1,4,36,228,1540,8964,56292,316388,1857028, 10301892,57884132,312915172,1720407492,9132560068, 48898964964,256790538660,1350883911620, 6992031608260,36296271612324,185785685287076, 952221494828996,4831039856692356, 24489621255994276] |