A034233 Number of quaternary codes of length 2 with n words.

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

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