n | a(n) |
---|---|
0 | 1 |
1 | 18 |
2 | 126 |
3 | 570 |
4 | 1980 |
5 | 5742 |
6 | 14586 |
7 | 33462 |
8 | 70785 |
9 | 140140 |
10 | 262548 |
11 | 469404 |
12 | 806208 |
13 | 1337220 |
14 | 2151180 |
15 | 3368244 |
16 | 5148297 |
17 | 7700814 |
18 | 11296450 |
19 | 16280550 |
20 | 23088780 |
21 | 32265090 |
22 | 44482230 |
23 | 60565050 |
24 | 81516825 |
25 | 108548856 |
26 | 143113608 |
27 | 186941656 |
[1,18,126,570,1980,5742,14586,33462,70785,140140, 262548,469404,806208,1337220,2151180,3368244, 5148297,7700814,11296450,16280550,23088780, 32265090,44482230,60565050,81516825,108548856, 143113608,186941656] |