n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 6 |
3 | 45 |
4 | 126 |
5 | 750 |
6 | 2796 |
7 | 19389 |
8 | 75894 |
9 | 449562 |
10 | 2027796 |
11 | 12211794 |
12 | 57895596 |
13 | 332787324 |
14 | 1677545304 |
15 | 9766642077 |
16 | 50378641830 |
17 | 286825948194 |
18 | 1529968671492 |
19 | 8729259097158 |
20 | 47374697101572 |
21 | 269062276076868 |
22 | 1484430536591592 |
[1,3,6,45,126,750,2796,19389,75894,449562,2027796, 12211794,57895596,332787324,1677545304,9766642077, 50378641830,286825948194,1529968671492, 8729259097158,47374697101572,269062276076868, 1484430536591592] |