A262851 Number of (2+2)X(n+2) 0..1 arrays with each row divisible by 7 and column not divisible by 7, read as a binary number with top and left being the most significant bits.

13, 34, 196, 3181, 31050, 352880, 4679725, 58693450, 749598500, 9769811821, 126477115922, 1640601801744, 21334300812253, 277222463778754, 3602979823609668, 46840315814579821, 608897998235183514

Offset: 1

Author

R. H. Hardin, Oct 03 2015

Keywords

• nonn

Comments

Row 2 of A262849.

Examples

			Some solutions for n=4
..1..1..1..1..1..1....1..1..1..1..1..1....0..1..1..1..0..0....0..1..1..1..0..0
..1..0..1..0..1..0....0..1..0..1..0..1....0..0..0..1..1..1....0..0..0..0..0..0
..1..0..1..0..1..0....0..0..0..1..1..1....1..1..0..0..0..1....1..1..0..0..0..1
..1..0..1..0..1..0....0..1..0..1..0..1....0..1..1..1..0..0....1..1..1..1..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A262849.