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 A251779 T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum 3 or 6 and every diagonal and antidiagonal sum not 3 or 6 9
 470, 1142, 1142, 2402, 4182, 2402, 4790, 12242, 12242, 4790, 12302, 34934, 43778, 34934, 12302, 27242, 132886, 144818, 144818, 132886, 27242, 55766, 430730, 748002, 524774, 748002, 430730, 55766, 148022, 1317638, 2861058, 3849230, 3849230 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ....470.....1142......2402.......4790........12302.........27242..........55766 ...1142.....4182.....12242......34934.......132886........430730........1317638 ...2402....12242.....43778.....144818.......748002.......2861058........9758786 ...4790....34934....144818.....524774......3849230......16580426.......60326174 ..12302...132886....748002....3849230.....39849294.....247384810.....1341002006 ..27242...430730...2861058...16580426....247384810....1752287522....10300749962 ..55766..1317638...9758786...60326174...1341002006...10300749962....63113882510 .148022..5134774..51133714..447979046..13904412166..154175434186..1412118575318 .332738.17297338.198564354.1931849642..89606678130.1105860243970.10829849843426 .688646.54845894.686684594.7044376358.502599987230.6575712526154.66416445639470 LINKS R. H. Hardin, Table of n, a(n) for n = 1..420 FORMULA Empirical for column k: k=1: a(n) = a(n-1) +16*a(n-3) -16*a(n-4) -39*a(n-6) +39*a(n-7) -36*a(n-9) +36*a(n-10) k=2: [order 31] k=3: [order 31] k=4: [order 22] k=5: [order 85] k=6: [order 85] k=7: [order 64] EXAMPLE Some solutions for n=3 k=4 ..2..3..1..2..0..1....3..3..0..3..0..0....2..1..0..2..1..0....0..3..0..3..0..0 ..3..3..0..3..3..0....2..1..3..2..1..3....0..0..3..0..0..3....2..1..3..2..1..0 ..1..0..2..1..0..2....1..2..0..1..2..0....1..2..0..1..2..3....1..2..0..1..2..3 ..2..3..1..2..3..1....0..3..3..0..3..3....2..1..3..2..1..0....3..0..3..0..3..0 ..0..0..3..3..0..0....2..1..3..2..1..0....3..0..3..3..0..3....2..1..3..2..1..0 CROSSREFS Sequence in context: A345776 A277119 A104744 * A251772 A253518 A254423 Adjacent sequences: A251776 A251777 A251778 * A251780 A251781 A251782 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Dec 08 2014 STATUS approved

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Last modified May 27 16:57 EDT 2024. Contains 372880 sequences. (Running on oeis4.)