n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 3 |
3 | 1 |
4 | 18 |
5 | 15 |
6 | 138 |
7 | 189 |
8 | 1218 |
9 | 2280 |
10 | 11826 |
11 | 27225 |
12 | 123013 |
13 | 325611 |
14 | 1346631 |
15 | 3919188 |
16 | 15318342 |
17 | 47563620 |
18 | 179405250 |
19 | 582336054 |
20 | 2148831144 |
21 | 7191954822 |
22 | 26193070008 |
23 | 89559039141 |
24 | 323765075223 |
25 | 1123859351610 |
26 | 4047466156545 |
[1,0,3,1,18,15,138,189,1218,2280,11826,27225, 123013,325611,1346631,3919188,15318342,47563620, 179405250,582336054,2148831144,7191954822, 26193070008,89559039141,323765075223, 1123859351610,4047466156545] |