login
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
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.
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
KEYWORD
nonn
AUTHOR
Tilman Piesk, Nov 10 2014
STATUS
approved