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A004371 as a simple table

na(n)
31
428
5595
611480
7211876
83819816
967945521
101198774720
1121042072975
12368136785016
136426898010533
14112044912118048
151951641934005400
1633976189889821200
17591315394579074378
1810289781864706066800

[1,28,595,11480,211876,3819816,67945521,
 1198774720,21042072975,368136785016,6426898010533,
 112044912118048,1951641934005400,
 33976189889821200,591315394579074378,
 10289781864706066800]