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A252418 Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 5 6 or 7 1
1099, 1098, 2348, 3796, 11409, 30724, 53782, 173544, 488169, 862550, 2861114, 8190964, 14510150, 48759525, 140792605, 249710691, 844670520, 2449784273, 4347633163, 14756809096, 42898150674, 76155945522, 258954750275 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A252423

LINKS

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

FORMULA

Empirical: a(n) = 38*a(n-3) -510*a(n-6) +3209*a(n-9) -10762*a(n-12) +20397*a(n-15) -22122*a(n-18) +13410*a(n-21) -4305*a(n-24) +686*a(n-27) -40*a(n-30) for n>37

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A186476 A096926 A249287 * A261911 A276708 A277797

Adjacent sequences: A252415 A252416 A252417 * A252419 A252420 A252421

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified February 3 05:52 EST 2023. Contains 360024 sequences. (Running on oeis4.)