A180793 T(n,k)=number of distinct solutions of sum{i=1..k}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 1..n-1.

0, 0, 1, 0, 0, 2, 0, 1, 1, 2, 0, 0, 3, 4, 3, 0, 1, 7, 14, 9, 2, 0, 0, 5, 30, 46, 19, 4, 0, 1, 9, 64, 142, 106, 31, 4, 0, 0, 15, 112, 400, 502, 254, 42, 4, 0, 1, 12, 198, 1004, 1914, 1519, 494, 75, 3, 0, 0, 18, 318, 2282, 6404, 7589, 3828, 939, 91, 6, 0, 1, 26, 502, 4868, 19300

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

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

.2..1....3.....7......5.......9.......15.......12........18.........26

.2..4...14....30.....64.....112......198......318.......502........744

.3..9...46...142....400....1004.....2282.....4868......9721......18475

.2.19..106...502...1914....6404....19300....53133....135902.....326446

.4.31..254..1519...7589...32890...126861...444019...1430707....4292149

.4.42..494..3828..24902..137528...670058..2935676..11752870...43506488

.4.75..939..9145..73134..499641..2997685.16112283..78770466..354466019

.3.91.1528.18966.188315.1579113.11539243.75118525.442714845.2391684440

Links

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