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A234226 Number of (n+1)X(7+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant stress 1X1 tilings) 1
582144, 1123724, 2264904, 5162984, 12178344, 31418264, 83324136, 236748824, 690049704, 2128516184, 6731960424, 22318060184, 75732130344, 266822847704, 958417428456, 3541285003544, 13272289633704, 50766360814424 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A234227

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..23

FORMULA

Empirical: a(n) = 10*a(n-1) +16*a(n-2) -460*a(n-3) +789*a(n-4) +7170*a(n-5) -23944*a(n-6) -39920*a(n-7) +246076*a(n-8) -38440*a(n-9) -1115136*a(n-10) +1151040*a(n-11) +2005056*a(n-12) -3657600*a(n-13) -331776*a(n-14) +3456000*a(n-15) -1658880*a(n-16)

EXAMPLE

Some solutions for n=1

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

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

CROSSREFS

Sequence in context: A119402 A187374 A237209 * A190682 A231253 A212468

Adjacent sequences:  A234223 A234224 A234225 * A234227 A234228 A234229

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 21 2013

STATUS

approved

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Last modified July 26 16:44 EDT 2021. Contains 346294 sequences. (Running on oeis4.)