n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 33 |
6 | 166 |
7 | 792 |
8 | 3654 |
9 | 16455 |
10 | 72774 |
11 | 317367 |
12 | 1368608 |
13 | 5848140 |
14 | 24799548 |
15 | 104488541 |
16 | 437818374 |
17 | 1825747245 |
18 | 7581746154 |
19 | 31368531456 |
20 | 129358242306 |
21 | 531886946515 |
22 | 2181210602118 |
23 | 8923564277475 |
24 | 36428064156772 |
25 | 148413344768244 |
[0,0,1,6,33,166,792,3654,16455,72774,317367, 1368608,5848140,24799548,104488541,437818374, 1825747245,7581746154,31368531456,129358242306, 531886946515,2181210602118,8923564277475, 36428064156772,148413344768244] |