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A204150 Number of (n+2)X7 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
724154, 5117114, 26968208, 146747822, 839477288, 4563772922, 25275772916, 139642744838, 772194787088, 4262756025938, 23426861587412, 129342548942894, 714008916715904, 3937308974080682, 21720242779852508, 119827290425297702 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A204153

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..149

FORMULA

Empirical: a(n) = 6*a(n-1) -5*a(n-2) +2*a(n-3) +42*a(n-4) +82*a(n-5) -1852*a(n-6) +11132*a(n-7) +15422*a(n-8) -129256*a(n-9) +187216*a(n-10) +150068*a(n-11) -837240*a(n-12) -2041624*a(n-13) +3922712*a(n-14) +9523648*a(n-15) -75234672*a(n-16) +137677776*a(n-17) +108334336*a(n-18) -417274176*a(n-19) +572405504*a(n-20) -410308096*a(n-21) -275314688*a(n-22) +348913664*a(n-23) +5157380096*a(n-24) -10434699264*a(n-25) +5277319168*a(n-26) for n>27

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A100383 A250153 A252324 * A321495 A234495 A156867

Adjacent sequences:  A204147 A204148 A204149 * A204151 A204152 A204153

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 11 2012

STATUS

approved

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Last modified November 28 12:38 EST 2021. Contains 349403 sequences. (Running on oeis4.)