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A275224 Number of nX4 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,0) and new values introduced in order 0..2. 1
14, 216, 339, 1302, 6448, 32388, 164645, 844176, 4319300, 22083548, 112975642, 578036947, 2957212295, 15128798774, 77399122215, 395975649916, 2025811842566, 10364054079218, 53022552043867, 271263640161978, 1387785882638203 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A275228.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -4*a(n-2) +18*a(n-4) -213*a(n-5) +254*a(n-6) -43*a(n-7) +348*a(n-8) +571*a(n-9) -1746*a(n-10) -33*a(n-11) +741*a(n-12) -1412*a(n-13) +2606*a(n-14) -243*a(n-15) -667*a(n-16) +1424*a(n-17) -2763*a(n-18) +1382*a(n-19) -742*a(n-20) +329*a(n-21) +281*a(n-22) -97*a(n-23) +88*a(n-24) -62*a(n-25) -27*a(n-26) -3*a(n-27) +7*a(n-28) -a(n-29) +3*a(n-30) -a(n-31) for n>35

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A275228.

Sequence in context: A202976 A331494 A208430 * A275144 A275354 A121972

Adjacent sequences:  A275221 A275222 A275223 * A275225 A275226 A275227

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 20 2016

STATUS

approved

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Last modified October 25 17:22 EDT 2021. Contains 348255 sequences. (Running on oeis4.)