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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