A218352 Number of n X 6 binary arrays with every 0 a horizontal or vertical neighbor to some 1.

31, 2007, 105913, 5609569, 300126903, 16031828359, 856149291505, 45726317510017, 2442206384575879, 130435504723928475, 6966420606934069925, 372069142324752766777, 19871816932607721069123, 1061332595121563636599299, 56684644723009252463918337, 3027466563967076563607945277

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..72

Example

Some solutions for n=3:
..1..1..0..1..1..1....0..1..1..1..0..1....1..1..1..1..1..0....0..0..1..1..0..1
..0..0..1..0..1..0....1..1..0..0..0..1....0..1..0..1..1..0....1..0..1..0..1..1
..1..0..0..1..1..0....0..0..0..1..0..0....0..1..1..1..1..1....1..0..1..0..0..1

Crossrefs

Column 6 of A218354.

Sequence in context: A042863 A042860 A184488 * A297549 A292706 A212156

Adjacent sequences: A218349 A218350 A218351 * A218353 A218354 A218355

Keyword

nonn,changed

Author

R. H. Hardin, Oct 26 2012

Extensions

New name from Andrew Howroyd, Jul 18 2026

Status

approved