cp's OEIS Frontend

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.

%I A180803 #6 Oct 10 2014 07:42:33
%S A180803 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,
%T A180803 1,20,159,549,620,355,64,11,1,25,270,1336,2338,1957,589,122,12,1,30,
%U A180803 435,3000,7770,9383,4507,1250,150,14,1,36,676,6302,23282,39768,28783,11171
%N 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.
%C A180803 Table starts
%C A180803 ..1...1....1.....1......1.......1........1.........1..........1...........1
%C A180803 ..2...4....6.....9.....12......16.......20........25.........30..........36
%C A180803 ..3...8...21....45.....87.....159......270.......435........676........1011
%C A180803 ..5..20...68...205....549....1336.....3000......6302......12502.......23616
%C A180803 ..5..28..142...620...2338....7770....23282.....63988.....163480......392306
%C A180803 ..8..56..355..1957...9383...39768...151473....526152....1687310.....5046199
%C A180803 ..7..64..589..4507..28783..158242...768541...3362296...13449091....49761514
%C A180803 .11.122.1250.11171..85956..576277..3422978..18294610...89142751...400327073
%C A180803 .12.150.1946.22146.213618.1770957.12879078..83656074..492505059..2659219164
%C A180803 .14.218.3372.45350.518268.5103172.44111410.340334735.2376231744.15184890632
%H A180803 R. H. Hardin, <a href="/A180803/b180803.txt">Table of n, a(n) for n=1..2016</a>
%K A180803 nonn,tabl
%O A180803 1,3
%A A180803 _R. H. Hardin_, suggested by _Max Alekseyev_ in the Sequence Fans Mailing List, Sep 20 2010