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A204148 Number of (n+2)X5 0..2 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order 1
22262, 156494, 844136, 4683434, 26968208, 152500334, 864266300, 4899355202, 27659513336, 156403395974, 885488808860, 5010133294922, 28351229796320, 160432064183822, 907680953036564, 5135781562487282, 29060183003735912 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A204153

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -5*a(n-2) +24*a(n-3) -90*a(n-4) +324*a(n-5) +678*a(n-6) -4752*a(n-7) -176*a(n-8) -2976*a(n-9) +29432*a(n-10) -1248*a(n-11) -59232*a(n-12) +123264*a(n-13) -85248*a(n-14) +193536*a(n-15) -525312*a(n-16) +331776*a(n-17) for n>18

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A217875 A253737 A185608 * A251825 A119568 A204333

Adjacent sequences:  A204145 A204146 A204147 * A204149 A204150 A204151

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 11 2012

STATUS

approved

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Last modified October 18 08:27 EDT 2021. Contains 348067 sequences. (Running on oeis4.)