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A111882 as a simple table

na(n)
01
11
20
34
44
536
6256
7400
817424
9784
101478656
11876096
12154753600
13560363584
1419057250304
15220388935936
162564046397696
1783038749753600
18327933273309184
1933173161139160064
2026222822450021376
2114475245839622726656

[1,1,0,4,4,36,256,400,17424,784,1478656,876096,
 154753600,560363584,19057250304,220388935936,
 2564046397696,83038749753600,327933273309184,
 33173161139160064,26222822450021376,
 14475245839622726656]