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A230678 Number of 4Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j) 1
0, 423, 17271, 730503, 37034355, 1844154933, 91258562955, 4522036938501, 224105728666527, 11105653159056021, 550345235166102387, 27272655718068842535, 1351510936295338591335, 66974836192708860686913 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A230675

LINKS

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

R. H. Hardin, Empirical recurrence of order 64

FORMULA

Empirical recurrence of order 64 (see link above)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A206408 A238174 A251013 * A091293 A114808 A134218

Adjacent sequences:  A230675 A230676 A230677 * A230679 A230680 A230681

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2013

STATUS

approved

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Last modified January 18 17:18 EST 2022. Contains 350455 sequences. (Running on oeis4.)