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A280212 Number of nX2 0..2 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 1
1, 2, 26, 92, 307, 1072, 3541, 11834, 38687, 125380, 403369, 1286926, 4082099, 12875608, 40414141, 126308002, 393216967, 1219867372, 3772323793, 11631678006, 35769955803, 109730814592, 335856708581, 1025808464330, 3127008856047 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A280217.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +6*a(n-2) -20*a(n-3) -49*a(n-4) +24*a(n-5) +148*a(n-6) +128*a(n-7) -48*a(n-8) -128*a(n-9) -64*a(n-10) for n>14

EXAMPLE

Some solutions for n=4

..0..1. .0..0. .0..1. .0..1. .0..1. .0..1. .0..0. .0..1. .0..0. .0..0

..1..1. .1..0. .0..0. .0..1. .2..2. .1..1. .0..0. .1..1. .1..1. .0..1

..1..1. .1..0. .2..2. .0..1. .2..1. .1..1. .0..1. .0..2. .1..1. .1..1

..2..1. .1..1. .2..2. .0..0. .1..1. .2..2. .0..1. .2..2. .1..2. .0..2

CROSSREFS

Cf. A280217.

Sequence in context: A229573 A067204 A202077 * A120551 A120547 A132470

Adjacent sequences:  A280209 A280210 A280211 * A280213 A280214 A280215

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2016

STATUS

approved

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Last modified April 6 11:02 EDT 2020. Contains 333273 sequences. (Running on oeis4.)