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A235278 Number of (n+1)X(8+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant stress 1X1 tilings) 1
15520, 19060, 23000, 31504, 41704, 64168, 93992, 160888, 260680, 487960, 867560, 1744024, 3354184, 7125208, 14577512, 32303128, 69232840, 158470360, 351398120, 824485144, 1873576264, 4478463448, 10354825832, 25091436568, 58718701000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A235280

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..109

FORMULA

Empirical: a(n) = a(n-1) +15*a(n-2) -15*a(n-3) -80*a(n-4) +80*a(n-5) +180*a(n-6) -180*a(n-7) -144*a(n-8) +144*a(n-9)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A246912 A035920 A201344 * A329769 A100973 A247692

Adjacent sequences:  A235275 A235276 A235277 * A235279 A235280 A235281

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified June 1 04:57 EDT 2020. Contains 334758 sequences. (Running on oeis4.)