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A264941 as a simple table

na(n)
10
21
356
43201
5307016
643200625
78403205056
82162875665601
9712215325718576
10292162814336854881
11146127700393451369000

[0,1,56,3201,307016,43200625,8403205056,
 2162875665601,712215325718576,292162814336854881,
 146127700393451369000]