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A230333 Number of nX4 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 1
0, 218, 9162, 438284, 20948996, 1000237228, 47762574418, 2280709396620, 108906096073720, 5200372305609456, 248322849692519928, 11857658272313328204, 566214747784257207798, 27037306460214124070716 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A230337

LINKS

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

FORMULA

Empirical: a(n) = 48*a(n-1) +28*a(n-2) -1810*a(n-3) -5084*a(n-4) +24565*a(n-5) +85859*a(n-6) +346698*a(n-7) -99352*a(n-8) -17542863*a(n-9) -18713044*a(n-10) +418955644*a(n-11) +248749776*a(n-12) -7264990096*a(n-13) -1407152832*a(n-14) +90735516736*a(n-15) +40012649216*a(n-16) -630054322176*a(n-17) -106033475584*a(n-18) +2287216246784*a(n-19) -645639110656*a(n-20) -188203139072*a(n-21) +27446476800*a(n-22) -14344519680*a(n-23) -4294967296*a(n-24) for n>26

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A232513 A224741 A209824 * A060530 A252997 A126829

Adjacent sequences: A230330 A230331 A230332 * A230334 A230335 A230336

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 16 2013

STATUS

approved

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Last modified February 1 16:06 EST 2023. Contains 359993 sequences. (Running on oeis4.)