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A234212 Number of (n+1)X(3+1) 0..4 arrays with every 2X2 subblock having the sum of the squares of all six edge and diagonal differences equal to 11 1
1248, 7348, 40384, 257116, 1493960, 10151836, 61124816, 436731604, 2691478528, 19921334892, 124589784024, 943832420732, 5956411209864, 45787739783180, 290541956700232, 2253568406359316, 14346530351364936, 111883000131558748 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234217

LINKS

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

FORMULA

Empirical: a(n) = 223*a(n-2) -22136*a(n-4) +1303842*a(n-6) -51198565*a(n-8) +1426660738*a(n-10) -29308622249*a(n-12) +455180602960*a(n-14) -5436994724661*a(n-16) +50553279723332*a(n-18) -368988227986457*a(n-20) +2126351180635715*a(n-22) -9709003146923883*a(n-24) +35189269788128342*a(n-26) -101259728165773203*a(n-28) +231060390001397360*a(n-30) -417017561764832798*a(n-32) +592925182387254959*a(n-34) -660503855304387479*a(n-36) +572258984227035715*a(n-38) -381879096938313788*a(n-40) +193753758860748742*a(n-42) -73452183198353516*a(n-44) +20317503519116744*a(n-46) -3966504433028624*a(n-48) +520682605459552*a(n-50) -42615909301440*a(n-52) +1905181236480*a(n-54) -34505662464*a(n-56)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A251648 A235021 A184500 * A047629 A221012 A233167

Adjacent sequences:  A234209 A234210 A234211 * A234213 A234214 A234215

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 21 2013

STATUS

approved

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Last modified October 28 10:26 EDT 2020. Contains 338054 sequences. (Running on oeis4.)