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A252204 Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7 1
4743, 5178, 17276, 44322, 215814, 932474, 2568954, 12883538, 56985498, 157484310, 797509638, 3566734178, 9868152522, 50206875026, 225779395146, 624968086326, 3187016754054, 14371363263554, 39789382386954, 203137189251218 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A252210

LINKS

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

FORMULA

Empirical: a(n) = 118*a(n-3) -4263*a(n-6) +55050*a(n-9) -221016*a(n-12) +206976*a(n-15) +225280*a(n-18) -262144*a(n-21) for n>25

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A234086 A093789 A252226 * A083637 A083638 A237553

Adjacent sequences:  A252201 A252202 A252203 * A252205 A252206 A252207

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2014

STATUS

approved

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Last modified September 22 17:39 EDT 2021. Contains 347607 sequences. (Running on oeis4.)