A072189 Weight distribution of [103,52,19] binary quadratic-residue (or QR) code.

1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 218875, 919275, 0, 0, 47592180, 158640600, 0, 0, 4283380248, 11626317816, 0, 0, 174684872920, 393040964070, 0, 0, 3432179437380, 6483005603940, 0, 0, 33982965303425, 54372744485480

Offset

0,20

Comments

Taken from the Tjhai-Tomlinson web site.

Links

Table of n, a(n) for n=0..40.

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
19 218875
20 919275
23 47592180
24 158640600
27 4283380248
28 11626317816
31 174684872920
32 393040964070
35 3432179437380
36 6483005603940
39 33982965303425
40 54372744485480
43 174960847539720
44 238582973917800
47 478328764312680
48 558050225031460
51 703022265147378
52 703022265147378
55 558050225031460
56 478328764312680
59 238582973917800
60 174960847539720
63 54372744485480
64 33982965303425
67 6483005603940
68 3432179437380
71 393040964070
72 174684872920
75 11626317816
76 4283380248
79 158640600
80 47592180
83 919275
84 218875
103 1

Crossrefs

Sequence in context: A090873 A236040 A251480 * A187865 A201227 A185531

Adjacent sequences: A072186 A072187 A072188 * A072190 A072191 A072192

Keyword

nonn,fini

Author

N. J. A. Sloane, Apr 11 2009

Status

approved