A297512 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 2 neighboring 1s.

1, 2735, 53175, 573119, 35919085, 1272836591, 28914051279, 949224569894, 32507021089982, 940396282368163, 28523594741249476, 910897573503281049, 27940827448011878850, 852581385081080135117, 26505475722899552411184

Offset

1,2

Comments

Row 7 of A297506.

Links

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

Example

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

Crossrefs

Cf. A297506.

Sequence in context: A045155 A251989 A251985 * A297726 A122473 A253994

Adjacent sequences: A297509 A297510 A297511 * A297513 A297514 A297515

Keyword

nonn

Author

R. H. Hardin, Dec 31 2017

Status

approved