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| A034253
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Triangle read by rows: T(n,k) = number of inequivalent linear [n,k] binary codes without 0 columns (n >= 1, 1 <= k <= n).
(history;
published version)
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#60 by Joerg Arndt at Thu Oct 03 02:52:28 EDT 2019
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#59 by Michel Marcus at Thu Oct 03 01:44:28 EDT 2019
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#58 by Petros Hadjicostas at Wed Oct 02 20:08:02 EDT 2019
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#57 by Petros Hadjicostas at Wed Oct 02 20:07:15 EDT 2019
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Petr Lisonek, <a href="https://doi.org/10.1016/j.jcta.2006.06.013">Combinatorial families enumerated by quasi-polynomials</a>, J. Combin. Theory Ser. A 114(4) (2007), 619-630. [See Section 5.]
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#56 by Petros Hadjicostas at Wed Oct 02 19:07:40 EDT 2019
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#55 by Petros Hadjicostas at Wed Oct 02 19:07:37 EDT 2019
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H. Harald Fripertinger, <a href="http://www.mathe2.uni-bayreuth.de/frib/codes/tables.html">Isometry Classes of Codes</a>.
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#54 by Petros Hadjicostas at Wed Oct 02 14:35:44 EDT 2019
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#53 by Petros Hadjicostas at Wed Oct 02 14:34:12 EDT 2019
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| FORMULA
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T(n,k=2) = floor(n/2) + floor((n^2 + 6)/12) = A253186(n).
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#52 by Petros Hadjicostas at Wed Oct 02 13:20:59 EDT 2019
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#51 by Petros Hadjicostas at Wed Oct 02 13:20:41 EDT 2019
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Wikipedia, <a href="https://en.wikipedia.org/wiki/Projective_linear_group">Projective linear group</a>.
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