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The check matrix of a [20,10,9]8. A double circulant code.

10000000001010237222
01000000000102372221
00100000001023722210
00010000000237222101
00001000002372221010
00000100003722210102
00000010007222101023
00000001002221010237
00000000102210102372
00000000012101023722

The prime polynomial used to generate GF(8) is: X3+X2+1. The element f=aX2+bX+c, a,b,c in {0,1}, is written as the number a*4+b*2+c.

The weight distribution (formal selfdual):

A'0= 1, A'9= 7210, A'10= 52955, A'11= 307300, A'12= 1597785, A'13= 7033740, A'14= 24483270, A'15= 68539968, A'16= 149888445, A'17= 247118970, A'18= 288045695, A'19= 212359980, A'20= 74306505.


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