n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 232 |
4 | 2108 |
5 | 20384 |
6 | 206392 |
7 | 2165720 |
8 | 23385340 |
9 | 258532216 |
10 | 2915343808 |
11 | 33437862352 |
12 | 389230520888 |
13 | 4590271681064 |
14 | 54767161155000 |
15 | 660307913374352 |
16 | 8036973478493436 |
17 | 98672644594401736 |
18 | 1221090110502080440 |
19 | 15222093531642444504 |
[1,4,28,232,2108,20384,206392,2165720,23385340, 258532216,2915343808,33437862352,389230520888, 4590271681064,54767161155000,660307913374352, 8036973478493436,98672644594401736, 1221090110502080440,15222093531642444504] |