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A251775 Number of (n+2)X(4+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 1
4790, 34934, 144818, 524774, 3849230, 16580426, 60326174, 447979046, 1931849642, 7044376358, 52367746670, 225917404970, 823970129438, 6126491803910, 26431112366090, 96403314882278, 716807227554830, 3092492752787210 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A251779
LINKS
FORMULA
Empirical: a(n) = a(n-1) +146*a(n-3) -146*a(n-4) -3605*a(n-6) +3605*a(n-7) +24400*a(n-9) -24400*a(n-10) +61000*a(n-12) -61000*a(n-13) -1184000*a(n-15) +1184000*a(n-16) +3392000*a(n-18) -3392000*a(n-19) -1024000*a(n-21) +1024000*a(n-22)
EXAMPLE
Some solutions for n=3
..1..1..1..1..1..1....1..3..2..1..0..2....0..3..0..3..0..0....1..3..2..1..0..2
..0..2..1..3..2..1....0..3..3..0..3..0....3..2..1..0..2..1....0..3..0..3..0..0
..2..3..1..2..0..1....2..0..1..2..3..1....0..1..2..0..1..2....2..0..1..2..3..1
..1..1..1..1..1..1....1..0..2..1..0..2....3..3..0..3..3..0....1..3..2..1..0..2
..3..2..1..3..2..1....3..3..0..3..3..0....0..2..1..3..2..1....0..3..0..3..3..0
CROSSREFS
Sequence in context: A138087 A354086 A296812 * A096517 A221005 A227495
KEYWORD
nonn
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.)