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A278731 as a simple table

na(n)
1456
2121520
328637916
46410559865
51351385130108
6268284486351027
750067074390669892
88732216738504713198
91415177080112634284232
10212485358907612452321760
1129562031801069787043980684

[456,121520,28637916,6410559865,1351385130108,
 268284486351027,50067074390669892,
 8732216738504713198,1415177080112634284232,
 212485358907612452321760,
 29562031801069787043980684]