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 A252417 Number of (n+2)X(2+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
 1006, 854, 1098, 1704, 3472, 7186, 12214, 28034, 60808, 104972, 247716, 545384, 946098, 2250884, 4981124, 8656564, 20654540, 45800766, 79656236, 190278230, 422299752, 734708854, 1755888982, 3898476014, 6783565818, 16215635648 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A252423 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 23*a(n-3) -199*a(n-6) +843*a(n-9) -1874*a(n-12) +2149*a(n-15) -1091*a(n-18) +15*a(n-21) +197*a(n-24) -70*a(n-27) +8*a(n-30) for n>37 EXAMPLE Some solutions for n=4 ..1..0..2..2....1..1..2..1....3..1..0..0....0..0..1..0....0..0..1..0 ..0..3..0..0....3..0..1..3....0..1..0..3....0..0..1..0....0..3..1..0 ..2..0..2..2....0..0..1..0....1..2..1..1....1..1..2..1....1..1..2..1 ..2..0..2..2....1..1..2..1....0..1..3..0....0..0..1..0....0..0..1..0 ..0..3..0..0....0..0..1..3....3..1..0..0....0..0..1..0....3..0..1..3 ..2..0..2..2....0..3..1..0....1..2..1..1....1..1..2..1....1..1..2..1 CROSSREFS Sequence in context: A013686 A153226 A202147 * A067918 A163557 A241932 Adjacent sequences: A252414 A252415 A252416 * A252418 A252419 A252420 KEYWORD nonn AUTHOR R. H. Hardin, Dec 17 2014 STATUS approved

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Last modified March 26 09:11 EDT 2023. Contains 361529 sequences. (Running on oeis4.)