n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 7 |
4 | 33 |
5 | 131 |
6 | 473 |
7 | 1611 |
8 | 5281 |
9 | 16867 |
10 | 52905 |
11 | 163835 |
12 | 502769 |
13 | 1532883 |
14 | 4651897 |
15 | 14070379 |
16 | 42456897 |
17 | 127894979 |
18 | 384799049 |
19 | 1156756443 |
20 | 3475250065 |
21 | 10436235955 |
22 | 31330727961 |
23 | 94038321227 |
24 | 282211432673 |
25 | 846835624611 |
[0,0,1,7,33,131,473,1611,5281,16867,52905,163835, 502769,1532883,4651897,14070379,42456897, 127894979,384799049,1156756443,3475250065, 10436235955,31330727961,94038321227,282211432673, 846835624611] |