A268977 Number of 7Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

2187, 184320, 5598720, 167226768, 4823705520, 137497776840, 3870355944960, 107884943899488, 2981278225929744, 81772049776604472, 2228316762081730176, 60378377050028640600, 1627890867639031100112, 43698886755490031302440

Offset

1,1

Comments

Row 7 of A268971.

Links

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

R. H. Hardin, Empirical recurrence of order 54

Formula

Empirical recurrence of order 54 (see link above)

Example

Some solutions for n=2
..0..0. .2..0. .0..0. .0..1. .1..0. .1..0. .0..0. .1..1. .1..0. .0..1
..1..0. .1..2. .1..2. .1..0. .1..2. .0..1. .0..1. .2..2. .0..1. .0..2
..1..1. .1..0. .2..2. .0..1. .1..2. .2..2. .2..2. .1..2. .0..1. .1..2
..0..0. .0..0. .2..1. .2..1. .0..0. .2..1. .1..0. .1..0. .2..1. .2..2
..0..1. .0..0. .2..2. .2..1. .1..2. .0..2. .1..2. .1..0. .0..0. .1..0
..2..1. .0..1. .0..1. .2..2. .2..2. .1..2. .2..1. .0..1. .0..1. .0..1
..2..2. .2..1. .2..2. .1..0. .2..2. .1..0. .0..1. .2..2. .0..0. .2..2

Crossrefs

Cf. A268971.

Sequence in context: A224005 A210057 A232029 * A224358 A224017 A016771

Adjacent sequences: A268974 A268975 A268976 * A268978 A268979 A268980

Keyword

nonn

Author

R. H. Hardin, Feb 16 2016

Status

approved