n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 12 |
4 | 74 |
5 | 540 |
6 | 4682 |
7 | 47292 |
8 | 545834 |
9 | 7087260 |
10 | 102247562 |
11 | 1622632572 |
12 | 28091567594 |
13 | 526858348380 |
14 | 10641342970442 |
15 | 230283190977852 |
16 | 5315654681981354 |
17 | 130370767029135900 |
18 | 3385534663256845322 |
19 | 92801587319328411132 |
20 | 2677687796244384203114 |
21 | 81124824998504073881820 |
[0,0,2,12,74,540,4682,47292,545834,7087260, 102247562,1622632572,28091567594,526858348380, 10641342970442,230283190977852,5315654681981354, 130370767029135900,3385534663256845322, 92801587319328411132,2677687796244384203114, 81124824998504073881820] |