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A250003 Number of inequivalent binary linear codes of length n minus 2^n. 1
0, 0, 0, 0, 0, 0, 4, 20, 86, 336, 1273, 4880, 19938, 90662, 486753, 3285964, 29643278, 373908194, 6739368109, 173801125420, 6356254132640, 326203515419552, 23294352975946580, 2301176047756537128, 313285408199163993419, 58638266023262469408284 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

COMMENTS

The numbers of inequivalent binary linear codes of length n (A076766) start like the powers of two (A000079). This sequence is their difference. These are the row sums of the triangle A250002.

LINKS

Table of n, a(n) for n=0..25.

FORMULA

a(n) = A076766(n) - A000079(n).

EXAMPLE

There are 342 inequivalent binary linear codes of length 8, and 2^8 = 256, hence a(8) = 342 - 256 = 86.

CROSSREFS

Cf. A076766, A000079, A250002.

Sequence in context: A158608 A282084 A262768 * A196953 A093357 A027156

Adjacent sequences:  A250000 A250001 A250002 * A250004 A250005 A250006

KEYWORD

nonn

AUTHOR

Tilman Piesk, Nov 10 2014

STATUS

approved

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Last modified February 20 04:35 EST 2018. Contains 299358 sequences. (Running on oeis4.)