A145648 Weight distribution of [42,21,10] binary extended quadratic-residue (or QR) code.

1, 0, 0, 0, 0, 1722, 10619, 49815, 157563, 341530, 487326, 487326, 341530, 157563, 49815, 10619, 1722, 0, 0, 0, 0, 1

Offset

0,6

Comments

Taken from the Tjhai-Tomlinson web site.

Links

Table of n, a(n) for n=0..21.

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
10 1722
12 10619
14 49815
16 157563
18 341530
20 487326
22 487326
24 341530
26 157563
28 49815
30 10619
32 1722
42 1

Crossrefs

Sequence in context: A205195 A200958 A048958 * A035867 A271045 A031814

Adjacent sequences: A145645 A145646 A145647 * A145649 A145650 A145651

Keyword

nonn,fini,full

Author

N. J. A. Sloane, Mar 20 2009; example lines corrected Apr 11 2009

Status

approved