n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 9 |
3 | 72 |
4 | 567 |
5 | 4455 |
6 | 34992 |
7 | 274833 |
8 | 2158569 |
9 | 16953624 |
10 | 133155495 |
11 | 1045816839 |
12 | 8213952096 |
13 | 64513217313 |
14 | 506693386953 |
15 | 3979621526760 |
16 | 31256353258263 |
17 | 245490585583527 |
18 | 1928108090927376 |
19 | 15143557548094641 |
20 | 118939045114505385 |
21 | 934159388097696696 |
[0,1,9,72,567,4455,34992,274833,2158569,16953624, 133155495,1045816839,8213952096,64513217313, 506693386953,3979621526760,31256353258263, 245490585583527,1928108090927376, 15143557548094641,118939045114505385, 934159388097696696] |