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A034233 Number of quaternary codes of length 2 with n words. 0
1, 1, 2, 4, 10, 13, 23, 26, 32, 26, 23, 13, 10, 4, 2, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..72.

H. Fripertinger, Isometry Classes of Codes

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

CROSSREFS

Cf. A034188-.

Sequence in context: A100912 A174721 A026224 * A056718 A057283 A308987

Adjacent sequences:  A034230 A034231 A034232 * A034234 A034235 A034236

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Missing a(16)=1 inserted by Sean A. Irvine, Aug 08 2020

STATUS

approved

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Last modified December 1 01:17 EST 2021. Contains 349426 sequences. (Running on oeis4.)