n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 36 |
4 | 228 |
5 | 1545 |
6 | 11196 |
7 | 86457 |
8 | 708504 |
9 | 6136830 |
10 | 55976430 |
11 | 535904259 |
12 | 5369146272 |
13 | 56145107577 |
14 | 611336534802 |
15 | 6916529431620 |
16 | 81152874393168 |
17 | 985767316792449 |
18 | 12376996566040980 |
19 | 160399065135692073 |
[0,1,6,36,228,1545,11196,86457,708504,6136830, 55976430,535904259,5369146272,56145107577, 611336534802,6916529431620,81152874393168, 985767316792449,12376996566040980, 160399065135692073] |