

A180813


T(n,k)=number of distinct solutions of sum{i=1..k}(x(2i1)*x(2i)) = 1 (mod n), with x() in 0..n1


10



0, 0, 1, 0, 2, 2, 0, 4, 7, 2, 0, 6, 18, 12, 3, 0, 9, 42, 50, 24, 2, 0, 12, 84, 166, 136, 31, 4, 0, 16, 153, 474, 612, 262, 59, 4, 0, 20, 264, 1200, 2325, 1649, 583, 74, 4, 0, 25, 429, 2768, 7752, 8468, 4501, 974, 111, 3, 0, 30, 666, 5920, 23256, 37264, 28778, 9772, 1794, 121
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OFFSET

1,5


COMMENTS

Table starts
.0...0....0.....0......0.......0........0.........0..........0...........0
.1...2....4.....6......9......12.......16........20.........25..........30
.2...7...18....42.....84.....153......264.......429........666........1001
.2..12...50...166....474....1200.....2768......5920......11900.......22696
.3..24..136...612...2325....7752....23256.....63954.....163438......392250
.2..31..262..1649...8468...37264...145098....510927....1652886.....4972016
.4..59..583..4501..28778..158239...768537...3362288...13449080....49761505
.4..74..974..9772..79670..550860..3329262..17975676...88130750...397307654
.4.111.1794.21631.212049.1766580.12867751..83628636..492442470..2659084116
.3.121.2603.39911.484180.4912624.43149935.335900991.2357340087.15109820870


LINKS

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


CROSSREFS

Sequence in context: A072690 A199454 A244130 * A194656 A108520 A099087
Adjacent sequences: A180810 A180811 A180812 * A180814 A180815 A180816


KEYWORD

nonn,tabl


AUTHOR

R. H. Hardin, suggested by Max Alekseyev in the Sequence Fans Mailing List, Sep 20 2010


STATUS

approved



