n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 7 |
4 | 31 |
5 | 116 |
6 | 379 |
7 | 1133 |
8 | 3210 |
9 | 8803 |
10 | 23701 |
11 | 63239 |
12 | 168287 |
13 | 447905 |
14 | 1194814 |
15 | 3196180 |
16 | 8576505 |
17 | 23081668 |
18 | 62292381 |
19 | 168536249 |
20 | 457035453 |
21 | 1241954405 |
22 | 3381289332 |
23 | 9221603416 |
24 | 25189382006 |
25 | 68906572413 |
26 | 188750887991 |
[0,1,7,31,116,379,1133,3210,8803,23701,63239, 168287,447905,1194814,3196180,8576505,23081668, 62292381,168536249,457035453,1241954405, 3381289332,9221603416,25189382006,68906572413, 188750887991] |