n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 3 |
3 | 0 |
4 | 17 |
5 | 6 |
6 | 115 |
7 | 100 |
8 | 867 |
9 | 1236 |
10 | 7117 |
11 | 13770 |
12 | 62545 |
13 | 146866 |
14 | 579387 |
15 | 1537920 |
16 | 5581725 |
17 | 16002810 |
18 | 55329435 |
19 | 166465820 |
20 | 559913787 |
21 | 1736268432 |
22 | 5752600961 |
23 | 18182999274 |
24 | 59777071435 |
25 | 191287075320 |
[1,0,3,0,17,6,115,100,867,1236,7117,13770,62545, 146866,579387,1537920,5581725,16002810,55329435, 166465820,559913787,1736268432,5752600961, 18182999274,59777071435,191287075320] |