The check matrix of a [21,13,7]₈. For more information see Inverting construction Y₁.

100000010212411043745
010000002124111017472
001000021241110025155
000100012411102013165
000010024111021012230
000001041110212000635
000000111102124000013
000000000000000111111

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:

A'₀= 1, A'₆= 7, A'₁₀= 21, A'₁₁= 791, A'₁₂= 7707, A'₁₃= 38962, A'₁₄= 144053, A'₁₅= 461090, A'₁₆= 1223677, A'₁₇= 2550968, A'₁₈= 3944983, A'₁₉= 4325167, A'₂₀= 3068415, A'₂₁= 1011374,

A₀= 1, A₇= 8267, A₈= 76692, A₉= 722673, A₁₀= 5968620, A₁₁= 41580371, A₁₂= 242237926, A₁₃= 1174509441, A₁₄= 4701250344, A₁₅= 15357919913, A₁₆= 40307897875, A₁₇= 82981050747, A₁₈= 129092370092, A₁₉= 142688163513, A₂₀= 99868149682, A₂₁= 33293907731,

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