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 A252421 Number of (n+2)X(6+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
 3719, 7186, 30724, 62288, 365974, 1757580, 3582225, 21882869, 107926383, 220463165, 1375056342, 6880842955, 14073466867, 88795680194, 447871169161, 916696939171, 5820110209906, 29480626550553, 60364093961967 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A252423 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 135*a(n-3) -6200*a(n-6) +129658*a(n-9) -1479172*a(n-12) +10122008*a(n-15) -43818900*a(n-18) +123860492*a(n-21) -233367460*a(n-24) +297742037*a(n-27) -261058827*a(n-30) +159867108*a(n-33) -69122310*a(n-36) +20695032*a(n-39) -3955984*a(n-42) +409280*a(n-45) -16896*a(n-48) for n>56 EXAMPLE Some solutions for n=4 ..0..3..1..0..0..1..0..0....1..1..2..1..1..2..1..1....1..1..2..1..1..2..1..1 ..0..0..1..3..0..1..0..0....3..0..1..0..0..1..3..0....3..0..1..0..0..1..0..3 ..1..1..2..1..1..2..1..1....0..0..1..0..3..1..0..0....0..0..1..0..0..1..0..0 ..0..0..1..0..0..1..0..0....1..1..2..1..1..2..1..1....1..1..2..1..1..2..1..1 ..3..0..1..0..0..1..3..0....3..0..1..0..0..1..0..3....0..0..1..0..0..1..0..0 ..1..1..2..1..1..2..1..1....0..0..1..0..0..1..0..0....3..0..1..3..0..1..0..0 CROSSREFS Sequence in context: A252161 A180396 A158917 * A296908 A237736 A289512 Adjacent sequences: A252418 A252419 A252420 * A252422 A252423 A252424 KEYWORD nonn AUTHOR R. H. Hardin, Dec 17 2014 STATUS approved

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Last modified November 26 17:13 EST 2022. Contains 358362 sequences. (Running on oeis4.)