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A230172 Number of nX4 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j) 1
9, 1407, 78849, 4722977, 284444079, 17072965263, 1027868078181, 61861526624839, 3721702070420191, 223920929460093089, 13473042937456532657, 810647385075641076549, 48774886700839338028985, 2934683063063203660000047 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A230176

LINKS

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

R. H. Hardin, Empirical recurrence of order 81

FORMULA

Empirical recurrence of order 81 (see link above)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A270067 A213448 A120347 * A231191 A217267 A300594

Adjacent sequences:  A230169 A230170 A230171 * A230173 A230174 A230175

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 11 2013

STATUS

approved

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Last modified June 16 13:05 EDT 2021. Contains 345057 sequences. (Running on oeis4.)