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A007139 as a simple table

na(n)
01
12
26
326
4192
53014
6127757
716853750
87343780765
910733574184956
1052867617324773592
11882178116079222400788
1250227997322550920824045262
139837048598740665027344331562224
146681839615514161556535851222043192179
1515867777966020615016665849049841756464001994

[1,2,6,26,192,3014,127757,16853750,7343780765,
 10733574184956,52867617324773592,
 882178116079222400788,50227997322550920824045262,
 9837048598740665027344331562224,
 6681839615514161556535851222043192179,
 15867777966020615016665849049841756464001994]