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A234736 Number of (n+1)X(6+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 8 (constant stress 1X1 tilings) 1
119904, 233016, 423072, 972888, 2072256, 5395128, 13083552, 37239960, 99668544, 302942136, 872803872, 2789946648, 8503198656, 28292814648, 90149814432, 309941744280, 1023953849664, 3617288003256, 12314264477472, 44498943619608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A234738

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..28

FORMULA

Empirical: a(n) = 8*a(n-1) +53*a(n-2) -564*a(n-3) -888*a(n-4) +17184*a(n-5) -2382*a(n-6) -296784*a(n-7) +308859*a(n-8) +3196608*a(n-9) -5284083*a(n-10) -22169196*a(n-11) +48357478*a(n-12) +97763896*a(n-13) -273091508*a(n-14) -253071696*a(n-15) +976703832*a(n-16) +271829664*a(n-17) -2148744960*a(n-18) +304750080*a(n-19) +2640988800*a(n-20) -1133222400*a(n-21) -1378944000*a(n-22) +870912000*a(n-23)

EXAMPLE

Some solutions for n=1

..4..6..5..7..1..6..5....7..2..5..2..7..0..5....5..7..2..7..3..7..2

..6..0..7..1..3..0..7....4..7..2..7..4..5..2....6..0..3..0..4..0..3

CROSSREFS

Sequence in context: A257267 A175581 A031664 * A236094 A043622 A272597

Adjacent sequences:  A234733 A234734 A234735 * A234737 A234738 A234739

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2013

STATUS

approved

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Last modified July 17 08:40 EDT 2019. Contains 325097 sequences. (Running on oeis4.)