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A000986 Number of n X n symmetric matrices with (0,1) entries and all row sums 2.
(Formerly M3548 N1437)
+0
8
1, 0, 1, 4, 18, 112, 820, 6912, 66178, 708256, 8372754, 108306280, 1521077404, 23041655136, 374385141832, 6493515450688, 119724090206940, 2337913445039488, 48195668439235612, 1045828865817825264, 23826258064972682776, 568556266922455167040 (list; graph; listen)
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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