A250003 Number of inequivalent binary linear codes of length n minus 2^n.

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

Author

Tilman Piesk, Nov 10 2014

Keywords

• nonn

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.

Examples

			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.

Formula

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