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A251649 Number of (n+2)X(5+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 0 2 4 5 7 or 9 1
2382, 10248, 31022, 98306, 482506, 1563586, 5248890, 25151338, 86588602, 309874186, 1436889898, 5253854634, 19877542282, 89455192554, 344043647178, 1357743586282, 5972706277354, 23836807829578, 96793244877322 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A251652

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -3*a(n-2) +18*a(n-3) -234*a(n-4) +144*a(n-5) +993*a(n-6) -756*a(n-7) -755*a(n-8) +630*a(n-9) -42*a(n-11) for n>14

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A234818 A107530 A020394 * A218849 A254562 A186867

Adjacent sequences:  A251646 A251647 A251648 * A251650 A251651 A251652

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 06 2014

STATUS

approved

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Last modified September 28 22:34 EDT 2021. Contains 347717 sequences. (Running on oeis4.)