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A265967 Number of nX2 0..4 arrays with the absolute differences of each element with its with horizontal and vertical neighbors unique. 1
25, 288, 1504, 7656, 38096, 190308, 953072, 4776628, 23912032, 119676172, 599079504, 2999395220, 15015056688, 75162919892, 376276088880, 1883701849404, 9429821433376, 47206168911396, 236319556068624, 1183033090841396 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A265973.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-2) +76*a(n-3) +219*a(n-4) -150*a(n-5) -2179*a(n-6) -6990*a(n-7) -7878*a(n-8) +14114*a(n-9) +97811*a(n-10) +209622*a(n-11) +139056*a(n-12) -409764*a(n-13) -1836900*a(n-14) -2835340*a(n-15) -1654712*a(n-16) +6180672*a(n-17) +17827872*a(n-18) +20705808*a(n-19) +4962208*a(n-20) -56431488*a(n-21) -79309568*a(n-22) -99599360*a(n-23) +85772288*a(n-24) +144689152*a(n-25) +353329152*a(n-26) -42172416*a(n-27) -139067392*a(n-28) -541589504*a(n-29) +2097152*a(n-30) +25165824*a(n-31) +301989888*a(n-32) for n>33

EXAMPLE

Some solutions for n=4

..3..0....3..0....4..4....2..2....2..3....0..1....3..1....2..3....2..3....4..1

..3..1....1..1....0..0....1..3....2..3....3..3....0..4....0..0....4..0....0..3

..0..1....0..3....3..3....1..0....0..0....4..4....0..3....1..4....3..1....0..4

..0..3....4..4....2..2....4..4....4..4....2..1....4..1....3..2....0..4....3..1

CROSSREFS

Cf. A265973.

Sequence in context: A231790 A125413 A160084 * A225873 A029987 A017582

Adjacent sequences:  A265964 A265965 A265966 * A265968 A265969 A265970

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 19 2015

STATUS

approved

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Last modified January 24 19:34 EST 2022. Contains 350565 sequences. (Running on oeis4.)