n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 38 |
5 | 270 |
6 | 2342 |
7 | 23646 |
8 | 272918 |
9 | 3543630 |
10 | 51123782 |
11 | 811316286 |
12 | 14045783798 |
13 | 263429174190 |
14 | 5320671485222 |
15 | 115141595488926 |
16 | 2657827340990678 |
17 | 65185383514567950 |
18 | 1692767331628422662 |
19 | 46400793659664205566 |
20 | 1338843898122192101558 |
21 | 40562412499252036940910 |
[1,0,2,6,38,270,2342,23646,272918,3543630, 51123782,811316286,14045783798,263429174190, 5320671485222,115141595488926,2657827340990678, 65185383514567950,1692767331628422662, 46400793659664205566,1338843898122192101558, 40562412499252036940910] |