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A252565 Number of (7+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 4 6 or 7 1
6855, 37430, 270672, 748814, 6914968, 52263770, 145399017, 1341388351, 10184411086, 28321894951, 260779474542, 1989505296550, 5530905855092, 50840364519758, 389496897105008, 1082593348176820, 9933903062601790 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 7 of A252558
LINKS
FORMULA
Empirical: a(n) = 414*a(n-3) -49716*a(n-6) +1528047*a(n-9) -30967009*a(n-12) +445144640*a(n-15) -3431389746*a(n-18) +11737912047*a(n-21) -18662541672*a(n-24) +16329417636*a(n-27) -9970599024*a(n-30) +4262742720*a(n-33) -681198336*a(n-36) for n>45
EXAMPLE
Some solutions for n=2
..3..3..1..3....3..3..1..0....3..1..3..3....2..2..3..2....3..1..3..3
..0..2..2..0....3..2..2..3....2..2..3..2....3..2..2..3....2..2..3..2
..2..0..2..2....2..3..2..2....3..2..2..0....0..1..0..3....3..2..2..3
..3..3..1..3....3..3..1..3....3..1..3..3....2..2..3..2....3..1..3..3
..3..2..2..3....0..2..2..3....2..2..3..2....3..2..2..3....2..2..0..2
..2..0..2..2....2..3..2..2....3..2..2..0....3..1..3..3....3..2..2..3
..3..3..1..3....3..3..1..3....0..1..3..3....2..2..3..2....3..1..3..3
..3..2..2..3....0..2..2..3....2..2..3..2....0..2..2..0....2..2..0..2
..2..0..2..2....0..0..2..2....3..2..2..3....3..1..3..3....0..0..2..0
CROSSREFS
Sequence in context: A178277 A235899 A212076 * A066878 A176350 A114772
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 18 2014
STATUS
approved

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Last modified February 25 05:14 EST 2024. Contains 370310 sequences. (Running on oeis4.)