n | a(n) |
---|---|
1 | 0 |
2 | 18 |
3 | 408 |
4 | 2940 |
5 | 12600 |
6 | 40110 |
7 | 105168 |
8 | 240408 |
9 | 496080 |
10 | 945450 |
11 | 1690920 |
12 | 2870868 |
13 | 4667208 |
14 | 7313670 |
15 | 11104800 |
16 | 16405680 |
17 | 23662368 |
18 | 33413058 |
19 | 46299960 |
20 | 63081900 |
21 | 84647640 |
22 | 112029918 |
23 | 146420208 |
24 | 189184200 |
25 | 241878000 |
26 | 306265050 |
27 | 384333768 |
[0,18,408,2940,12600,40110,105168,240408,496080, 945450,1690920,2870868,4667208,7313670,11104800, 16405680,23662368,33413058,46299960,63081900, 84647640,112029918,146420208,189184200,241878000, 306265050,384333768] |