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A275127 Number of nX4 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,0) or (-1,1) and new values introduced in order 0..2. 1
14, 64, 174, 568, 2178, 8321, 31772, 121707, 466252, 1783920, 6825273, 26122839, 99981686, 382636173, 1464403303, 5604594713, 21449747744, 82091326930, 314176968483, 1202409074708, 4601819411125, 17611921823170, 67403757335393 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A275131.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -9*a(n-2) +19*a(n-3) -9*a(n-4) -9*a(n-5) +87*a(n-6) -46*a(n-7) -84*a(n-8) +7*a(n-9) -59*a(n-10) -45*a(n-11) +31*a(n-12) +23*a(n-13) +4*a(n-14) -a(n-15) -a(n-16) +a(n-17) for n>20

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A275131.

Sequence in context: A275179 A050396 A069964 * A074354 A212743 A124892

Adjacent sequences:  A275124 A275125 A275126 * A275128 A275129 A275130

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 17 2016

STATUS

approved

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Last modified April 15 07:59 EDT 2021. Contains 342975 sequences. (Running on oeis4.)