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A233710 Number of (n+1) X (1+1) 0..4 arrays with every 2 X 2 subblock having the sum of the squares of the edge differences equal to 14. 1
96, 444, 1992, 9100, 41256, 187780, 853104, 3879380, 17632896, 80165004, 364415160, 1656658972, 7531077336, 34236366580, 155637689056, 707528207972, 3216412089072, 14621779785788, 66470416900008, 302173810603052 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

Empirical: a(n) = 24*a(n-2) + 14*a(n-3) - 129*a(n-4) - 68*a(n-5) + 228*a(n-6) + 64*a(n-7) - 128*a(n-8).

Empirical g.f.: 4*x*(24 + 111*x - 78*x^2 - 725*x^3 - 96*x^4 + 1324*x^5 + 208*x^6 - 736*x^7) / (1 - 24*x^2 - 14*x^3 + 129*x^4 + 68*x^5 - 228*x^6 - 64*x^7 + 128*x^8). - Colin Barker, Oct 11 2018

EXAMPLE

Some solutions for n=5:

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

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

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

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

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

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

CROSSREFS

Column 1 of A233717.

Sequence in context: A233818 A233811 A233717 * A234083 A234076 A216372

Adjacent sequences:  A233707 A233708 A233709 * A233711 A233712 A233713

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2013

STATUS

approved

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Last modified October 15 01:40 EDT 2019. Contains 328025 sequences. (Running on oeis4.)