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A304920 as a simple table

na(n)
11
24
315
487
51054
621214
7649029
833757130
92831764125
10388624884126
1187386482775870
1232119546783363536
1319300894647086693888

[1,4,15,87,1054,21214,649029,33757130,2831764125,
 388624884126,87386482775870,32119546783363536,
 19300894647086693888]