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A197972 as a simple table

na(n)
12
26
338
4353
54316
664535
71140539
823256804
9537441242
1013880477011
11396218076728
1212386985584176
13420923890579262
1415447592770126360
15608903758014263549
1625656487848259583961
171150788495459483630200
1854745172171004903538415

[2,6,38,353,4316,64535,1140539,23256804,537441242,
 13880477011,396218076728,12386985584176,
 420923890579262,15447592770126360,
 608903758014263549,25656487848259583961,
 1150788495459483630200,54745172171004903538415]