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A254121 as a simple table

na(n)
17
261
3117643
4793714773254131
545671926166590716193865151022383844364247891937
6403343566675122500462878634623535631588559593930513766350645748813807

[7,61,117643,793714773254131,
 45671926166590716193865151022383844364247891937,
 40334356667512250046287863462353563158855959393051\
 3766350645748813807]