n | a(n) |
---|---|
1 | 0 |
2 | 9 |
3 | 18 |
4 | 108 |
5 | 279 |
6 | 1260 |
7 | 3780 |
8 | 15129 |
9 | 49158 |
10 | 185328 |
11 | 627759 |
12 | 2295720 |
13 | 7945560 |
14 | 28607049 |
15 | 100117098 |
16 | 357580548 |
17 | 1258634439 |
18 | 4476859380 |
19 | 15804569340 |
20 | 56096303769 |
21 | 198337427838 |
22 | 703204161768 |
23 | 2488241012319 |
24 | 8817078468240 |
25 | 31211247579120 |
26 | 110564953793289 |
[0,9,18,108,279,1260,3780,15129,49158,185328, 627759,2295720,7945560,28607049,100117098, 357580548,1258634439,4476859380,15804569340, 56096303769,198337427838,703204161768, 2488241012319,8817078468240,31211247579120, 110564953793289] |