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A268977 Number of 7Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once. 1
2187, 184320, 5598720, 167226768, 4823705520, 137497776840, 3870355944960, 107884943899488, 2981278225929744, 81772049776604472, 2228316762081730176, 60378377050028640600, 1627890867639031100112, 43698886755490031302440 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 7 of A268971.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2016
STATUS
approved

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Last modified February 26 09:21 EST 2024. Contains 370338 sequences. (Running on oeis4.)