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A260173 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001 1
409, 1001, 2598, 6973, 19701, 55849, 153286, 432380, 1232980, 3453740, 9694328, 27459576, 77441354, 217625342, 613977178, 1733263382, 4880225452, 13751170422, 38794513220, 109345894200, 308089966994, 868658498318, 2449053719350 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A260177

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-3) +25*a(n-4) +28*a(n-5) +66*a(n-6) +125*a(n-7) -15*a(n-8) +52*a(n-9) +338*a(n-10) -543*a(n-11) -412*a(n-12) +519*a(n-13) -1486*a(n-14) -1060*a(n-15) -1116*a(n-16) -1720*a(n-17) +4181*a(n-18) +1919*a(n-19) -9646*a(n-20) -5684*a(n-21) -4344*a(n-22) -771*a(n-23) +167*a(n-24) -4981*a(n-25) -16062*a(n-26) -11196*a(n-27) -20502*a(n-28) -4062*a(n-29) +5277*a(n-30) -11378*a(n-31) +6709*a(n-32) +39407*a(n-33) +38408*a(n-34) +7952*a(n-35) +943*a(n-36) +15819*a(n-37) +3082*a(n-38) -12144*a(n-39) -17820*a(n-40) +4556*a(n-41) +8167*a(n-42) -3328*a(n-43) -6859*a(n-44) -4984*a(n-45) +5034*a(n-46) +1592*a(n-47) +356*a(n-48) -710*a(n-49) +346*a(n-50) +538*a(n-51) -60*a(n-52) -52*a(n-53) -168*a(n-54) for n>57

EXAMPLE

Some solutions for n=4

..0..0..0..0..0..1....0..0..0..1..0..0....0..1..0..0..0..1....0..0..1..0..0..0

..0..1..0..0..0..0....0..0..0..0..0..0....0..0..1..0..0..0....0..0..0..1..0..0

..0..0..1..0..0..0....0..1..0..0..0..1....0..0..0..0..0..0....0..0..0..0..1..0

..0..0..0..1..0..0....1..0..0..0..1..0....1..0..0..0..0..1....1..0..0..0..0..1

..0..0..0..0..0..0....0..0..0..1..0..0....0..1..0..0..1..0....0..1..0..0..0..0

..0..1..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0....0..0..1..0..0..1

CROSSREFS

Cf. A260177

Sequence in context: A316934 A052354 A213079 * A321151 A052376 A201483

Adjacent sequences:  A260170 A260171 A260172 * A260174 A260175 A260176

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 17 2015

STATUS

approved

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Last modified October 15 00:14 EDT 2019. Contains 328025 sequences. (Running on oeis4.)