A180782 T(n,k)=number of distinct solutions of sum{i=1..k}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 1..n-1.

0, 0, 0, 0, 1, 0, 0, 0, 2, 1, 0, 1, 5, 6, 0, 0, 0, 3, 14, 13, 2, 0, 1, 7, 34, 42, 23, 0, 0, 0, 12, 62, 145, 119, 36, 3, 0, 1, 9, 118, 402, 522, 253, 62, 3, 0, 0, 15, 198, 995, 1960, 1518, 526, 78, 4, 0, 1, 22, 327, 2294, 6518, 7587, 4041, 944, 123, 0, 0, 0, 18, 499, 4856, 19467, 32893

Offset: 1

Author

R. H. Hardin Sep 20 2010

Keywords

• nonn
• tabl

Comments

Table starts

.0...0....0.....0......0.......0........0........0.........0..........0

.0...1....0.....1......0.......1........0........1.........0..........1

.0...2....5.....3......7......12........9.......15........22.........18

.1...6...14....34.....62.....118......198......327.......499........756

.0..13...42...145....402.....995.....2294.....4856......9730......18478

.2..23..119...522...1960....6518....19467....53455....136491.....327338

.0..36..253..1518...7587...32893...126864...444003...1430727....4292145

.3..62..526..4041..25470..139369...674922..2948305..11783122...43576141

.3..78..944..9150..73146..499659..2997717.16112289..78770456..354466005

.4.123.1702.19970.193036.1599064.11615754.75389116.443607864.2394458182

Links

• R. H. Hardin, Table of n, a(n) for n=1..2016