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A081300
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Diagonal of square array A081297.
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5
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1, 5, 55, 481, 10501, 117181, 3879331, 52751105, 2351234953, 37766866501, 2120129149711, 39311679607201, 2663716583547085, 56019878838007085, 4448878347069812251, 104660471059169187841, 9534251497305019644433
(list; graph; refs; listen; history; internal format)
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