A145685 Weight distribution of [120,60,20] binary extended quadratic-residue (or QR) code.

1, 0, 0, 0, 0, 56896, 12886944, 2935906752, 320496430380, 18071400219840, 552526728803616, 9491105395362624, 94116098389459776, 549827720843995776, 1920594821540759296, 4051982879111857664

Offset

0,6

Comments

Taken from the Tjhai-Tomlinson web site.

Links

Table of n, a(n) for n=0..15.

C. J. Tjhai and Martin Tomlinson, Weight Distributions of Quadratic Residue and Quadratic Double Circulant Codes over GF(2)

Example

The weight distribution is:
i A_i
0 1
20 56896
24 12886944
28 2935906752
32 320496430380
36 18071400219840
40 552526728803616
44 9491105395362624
48 94116098389459776
52 549827720843995776
56 1920594821540759296
60 4051982879111857664
64 5193576979998072832
68 4051982879111857664
72 1920594821540759296
76 549827720843995776
80 94116098389459776
84 9491105395362624
88 552526728803616
92 18071400219840
96 320496430380
100 2935906752
104 12886944
108 56896
128 1

Crossrefs

Sequence in context: A288076 A031683 A202568 * A333951 A292788 A138597

Adjacent sequences: A145682 A145683 A145684 * A145686 A145687 A145688

Keyword

nonn,fini

Author

N. J. A. Sloane, Apr 02 2009

Status

approved