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A034199
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Number of binary codes (not necessarily linear) of length n with 4 words.
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0
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0, 1, 6, 19, 47, 103, 203, 373, 649, 1079, 1727, 2681, 4048, 5969, 8620, 12218, 17028, 23378, 31654, 42324, 55941, 73155, 94725
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..23.
H. Fripertinger, Isometry Classes of Codes
H. Fripertinger, Enumeration, construction and random generation of block codes, Designs, Codes, Crypt., 14 (1998), 213-219.
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CROSSREFS
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Cf. A034188, A034189, A034190, A034191, A034192, A034193, A034194, A034195, A034196, A034197, A034198.
Sequence in context: A272047 A267829 A027963 * A272752 A272803 A273028
Adjacent sequences: A034196 A034197 A034198 * A034200 A034201 A034202
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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a(15)-a(23) from Sean A. Irvine, Aug 07 2020
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STATUS
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approved
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