0,2
(1727n^2 - 1725n)/2.
Sequence in context: A001235 A018850 A062924 this_sequence A154716 A154728 A033502
Adjacent sequences: A130856 A130857 A130858 this_sequence A130860 A130861 A130862
nonn
N. J. A. Sloane (njas(AT)research.att.com), Oct 06 2007, based on a suggestion from Anton Mravcek in 2004.
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