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A034188 Number of binary codes of length 3 with n words. 65
1, 1, 3, 3, 6, 3, 3, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

H. Fripertinger, Enumeration, construction and random generation of block codes, Designs, Codes, Crypt., 14 (1998), 213-219.

LINKS

Table of n, a(n) for n=0..98.

H. Fripertinger, Isometry Classes of Codes

FORMULA

a(n)=[C(2*n,n) mod 2]+{C[(n+1)^2,n+3] mod 2}+3*[C(n^2,n+2) mod 2]+3*{C[(n+11)^4,n+13] mod 2}+6*{C[(n+10)^4,n+12] mod 2}+3*{C[(n+9)^4,n+11] mod 2}+3*{C[(n+8)^4,n+10] mod 2}+{C[(n+7)^4,n+9] mod 2}+{C[(n+6)^4,n+8] mod 2} - Paolo P. Lava, Jan 07 2008

CROSSREFS

Cf. A034189, A034190, A034191, A034192, A034193, A034194, A034195, A034196, A034197.

A row of A039754.

Sequence in context: A236258 A105158 A020813 * A184849 A040007 A110634

Adjacent sequences:  A034185 A034186 A034187 * A034189 A034190 A034191

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 14 04:44 EDT 2019. Contains 327995 sequences. (Running on oeis4.)