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A257940 as a simple table

na(n)
10
21
352
4357
516776
6114985
75401852
837024845
91739379600
1011921885137
11560074829380
123838809989301
13180342355680792
141236084894669817
1558069678454385676
16398015497273691805
1718698256119956506912
18128159754037234091425
196020780400947540840020

[0,1,52,357,16776,114985,5401852,37024845,
 1739379600,11921885137,560074829380,3838809989301,
 180342355680792,1236084894669817,
 58069678454385676,398015497273691805,
 18698256119956506912,128159754037234091425,
 6020780400947540840020]