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A251506 as a simple table

na(n)
11988695378
266406260528122
32213399667918018212
473817882968740867259470
52461849509898181667047178526
682103804631580381524974704047000
72738199348379960068519012031321385958

[1988695378,66406260528122,2213399667918018212,
 73817882968740867259470,
 2461849509898181667047178526,
 82103804631580381524974704047000,
 2738199348379960068519012031321385958]