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A252123 Number of (n+2)X(1+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
380, 634, 1214, 2149, 4671, 9640, 17053, 37562, 78602, 138803, 310378, 655228, 1151221, 2604314, 5538692, 9687875, 22140202, 47381482, 82547749, 190299482, 409396004, 710842883, 1650780778, 3566811340, 6175729285, 14429116634 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A252130

LINKS

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

FORMULA

Empirical: a(n) = 25*a(n-3) -221*a(n-6) +784*a(n-9) -755*a(n-12) -683*a(n-15) +977*a(n-18) -126*a(n-21) for n>26

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A099728 A206349 A252130 * A158597 A252122 A250635

Adjacent sequences:  A252120 A252121 A252122 * A252124 A252125 A252126

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2014

STATUS

approved

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Last modified May 22 04:12 EDT 2022. Contains 353933 sequences. (Running on oeis4.)