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A268910 Number of 7Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 159744, 5038848, 154472184, 4513169016, 129834259704, 3679171151832, 103095286509168, 2860978283523432, 78747017051741472, 2152203067541169000, 58462727175138511872, 1579670961301113123600, 42485047384554878027688 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 7 of A268904.
LINKS
FORMULA
Empirical recurrence of order 54 (see link above)
EXAMPLE
Some solutions for n=2
..0..0. .1..1. .0..0. .1..0. .0..0. .2..0. .1..0. .1..0. .0..1. .1..0
..1..0. .0..0. .0..1. .0..2. .0..2. .1..0. .1..0. .2..1. .2..1. .2..2
..2..1. .1..2. .0..0. .1..2. .2..1. .1..0. .0..0. .2..1. .2..2. .2..2
..2..1. .2..1. .1..2. .2..2. .2..2. .0..1. .2..1. .2..1. .2..2. .2..1
..0..1. .0..0. .2..1. .2..1. .1..0. .0..0. .0..0. .0..1. .2..1. .2..1
..0..1. .0..1. .2..2. .0..0. .1..0. .0..1. .1..0. .0..0. .2..1. .0..1
..0..1. .2..2. .0..1. .0..1. .0..1. .0..0. .0..1. .0..0. .1..2. .2..2
CROSSREFS
Cf. A268904.
Sequence in context: A253729 A034210 A034212 * A223286 A223483 A202936
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2016
STATUS
approved

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Last modified May 27 00:17 EDT 2024. Contains 372847 sequences. (Running on oeis4.)