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A234880 Number of (n+1)X(6+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
1068, 2944, 5316, 22748, 44348, 261384, 518988, 3695496, 7370908, 57766200, 115385628, 946108608, 1890889692, 15833884200, 31653386076, 267691390256, 535199912860, 4547591259720, 9092552526460, 77436482160784, 154832004875388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A234882

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +64*a(n-2) -64*a(n-3) -1774*a(n-4) +1774*a(n-5) +28396*a(n-6) -28396*a(n-7) -294326*a(n-8) +294326*a(n-9) +2094938*a(n-10) -2094938*a(n-11) -10579203*a(n-12) +10579203*a(n-13) +38573258*a(n-14) -38573258*a(n-15) -102289192*a(n-16) +102289192*a(n-17) +197108892*a(n-18) -197108892*a(n-19) -273632948*a(n-20) +273632948*a(n-21) +268830864*a(n-22) -268830864*a(n-23) -181152608*a(n-24) +181152608*a(n-25) +79213344*a(n-26) -79213344*a(n-27) -20157312*a(n-28) +20157312*a(n-29) +2257920*a(n-30) -2257920*a(n-31)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A023078 A056102 A218564 * A218565 A145298 A145299

Adjacent sequences:  A234877 A234878 A234879 * A234881 A234882 A234883

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 01 2014

STATUS

approved

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Last modified November 15 01:05 EST 2019. Contains 329142 sequences. (Running on oeis4.)