n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 260 |
3 | 3212 |
4 | 39470 |
5 | 484760 |
6 | 5953532 |
7 | 73117640 |
8 | 897985850 |
9 | 11028509072 |
10 | 135445355180 |
11 | 1663456422080 |
12 | 20429547136382 |
13 | 250903113935780 |
14 | 3081437496506420 |
15 | 37844317258279532 |
16 | 464780593592780450 |
17 | 5708148959489987900 |
18 | 70103969470537620692 |
19 | 860973771077827270580 |
[1,20,260,3212,39470,484760,5953532,73117640, 897985850,11028509072,135445355180,1663456422080, 20429547136382,250903113935780,3081437496506420, 37844317258279532,464780593592780450, 5708148959489987900,70103969470537620692, 860973771077827270580] |