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A235279 Number of (n+1)X(9+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant stress 1X1 tilings) 1
35200, 41500, 48328, 62800, 79480, 115480, 160888, 260680, 401560, 716200, 1215928, 2348200, 4345240, 8936680, 17733688, 38288680, 80144920, 179655400, 391244728, 902914600, 2024143000, 4777083880, 10935717688, 26248208680 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 9 of A235280

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A085545 A031855 A186567 * A133282 A257724 A254016

Adjacent sequences:  A235276 A235277 A235278 * A235280 A235281 A235282

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified May 20 13:32 EDT 2022. Contains 353873 sequences. (Running on oeis4.)