A146075 Weight distribution of [41,21,9] binary quadratic-residue (or QR) code.

1, 0, 0, 0, 0, 0, 0, 0, 0, 410, 1312, 3034, 7585, 16605, 33210, 60024, 97539, 146370, 195160, 232060, 255266, 255266, 232060, 195160, 146370, 97539, 60024, 33210, 16605, 7585, 3034, 1312, 410, 0, 0, 0, 0, 0, 0, 0, 0, 1

Offset

0,10

Comments

Taken from the Tjhai-Tomlinson web site.

Links

Table of n, a(n) for n=0..41.

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
9 410
10 1312
11 3034
12 7585
13 16605
14 33210
15 60024
16 97539
17 146370
18 195160
19 232060
20 255266
21 255266
22 232060
23 195160
24 146370
25 97539
26 60024
27 33210
28 16605
29 7585
30 3034
31 1312
32 410
41 1

Crossrefs

Sequence in context: A157431 A179129 A176598 * A374270 A212710 A187991

Adjacent sequences: A146072 A146073 A146074 * A146076 A146077 A146078

Keyword

nonn,fini,full

Author

N. J. A. Sloane, Apr 07 2009

Status

approved