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 A180803 T(n,k)=number of distinct solutions to sum{i=1..k}(x(2i-1)*x(2i)) == 0 (mod n), with x() in 0..n-1. 11
 1, 1, 2, 1, 4, 3, 1, 6, 8, 5, 1, 9, 21, 20, 5, 1, 12, 45, 68, 28, 8, 1, 16, 87, 205, 142, 56, 7, 1, 20, 159, 549, 620, 355, 64, 11, 1, 25, 270, 1336, 2338, 1957, 589, 122, 12, 1, 30, 435, 3000, 7770, 9383, 4507, 1250, 150, 14, 1, 36, 676, 6302, 23282, 39768, 28783, 11171 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Table starts ..1...1....1.....1......1.......1........1.........1..........1...........1 ..2...4....6.....9.....12......16.......20........25.........30..........36 ..3...8...21....45.....87.....159......270.......435........676........1011 ..5..20...68...205....549....1336.....3000......6302......12502.......23616 ..5..28..142...620...2338....7770....23282.....63988.....163480......392306 ..8..56..355..1957...9383...39768...151473....526152....1687310.....5046199 ..7..64..589..4507..28783..158242...768541...3362296...13449091....49761514 .11.122.1250.11171..85956..576277..3422978..18294610...89142751...400327073 .12.150.1946.22146.213618.1770957.12879078..83656074..492505059..2659219164 .14.218.3372.45350.518268.5103172.44111410.340334735.2376231744.15184890632 LINKS R. H. Hardin, Table of n, a(n) for n=1..2016 CROSSREFS Sequence in context: A093010 A179000 A210559 * A093966 A103406 A142978 Adjacent sequences:  A180800 A180801 A180802 * A180804 A180805 A180806 KEYWORD nonn,tabl AUTHOR R. H. Hardin, suggested by Max Alekseyev in the Sequence Fans Mailing List, Sep 20 2010 STATUS approved

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Last modified April 8 08:48 EDT 2020. Contains 333313 sequences. (Running on oeis4.)