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A252124 Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 4 6 or 7 1
634, 1732, 5622, 10379, 34891, 120600, 218388, 776527, 2785875, 4949307, 18191635, 66629582, 116701535, 437583275, 1622139182, 2811915708, 10676440663, 39872706809, 68597203451, 262614612215, 985534471328, 1686109541499 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A252130

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +73*a(n-3) -73*a(n-4) -2065*a(n-6) +2065*a(n-7) +29083*a(n-9) -29083*a(n-10) -218284*a(n-12) +218284*a(n-13) +853720*a(n-15) -853720*a(n-16) -1434309*a(n-18) +1434309*a(n-19) -512391*a(n-21) +512391*a(n-22) +5300937*a(n-24) -5300937*a(n-25) -6791661*a(n-27) +6791661*a(n-28) +3067146*a(n-30) -3067146*a(n-31) -437400*a(n-33) +437400*a(n-34) for n>37

EXAMPLE

Some solutions for n=4

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

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

..2..2..1..2....1..1..3..1....2..1..2..2....1..3..1..1....1..2..2..1

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

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

..2..2..1..2....1..1..3..1....2..1..2..2....1..3..1..1....1..2..2..1

CROSSREFS

Sequence in context: A074762 A177684 A177214 * A112137 A260244 A250581

Adjacent sequences:  A252121 A252122 A252123 * A252125 A252126 A252127

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2014

STATUS

approved

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Last modified May 17 10:16 EDT 2022. Contains 353745 sequences. (Running on oeis4.)