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A278842 as a simple table

na(n)
01
12
255
327748
4344594008
5136380529541352
62157772538315935462248
71668027050325234150218003699928
875373026050211759045605399079260651909904
9234016759373014155226647943608719679545651260629498624

[1,2,55,27748,344594008,136380529541352,
 2157772538315935462248,
 1668027050325234150218003699928,
 75373026050211759045605399079260651909904,
 23401675937301415522664794360871967954565126062949\
 8624]