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A252515 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 4 6 or 7 0
806, 432, 1783, 5628, 74181, 1215491, 6486931, 304232630, 16970081459, 108911061618, 18397477779099, 3657274585418076, 25856975096624206, 16084237513106982571, 11697931298387098661798, 86957945614794531238579 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A252523
LINKS
EXAMPLE
Some solutions for n=4
..2..3..0..2..3..3....3..3..2..3..0..2....3..2..3..3..2..3....3..2..3..3..2..0
..1..2..2..1..2..2....2..2..1..2..2..1....2..1..2..2..1..2....2..1..2..2..1..2
..2..3..3..2..3..3....3..3..2..3..3..2....3..2..0..3..2..0....3..2..0..3..2..3
..2..0..3..2..3..3....0..3..2..3..0..2....3..2..3..3..2..3....0..2..3..3..2..3
..1..2..2..1..2..2....2..2..1..2..2..1....2..1..2..2..1..2....0..1..2..2..1..2
..2..3..3..2..3..0....3..0..2..3..3..2....0..2..3..3..2..0....3..2..3..3..2..0
CROSSREFS
Sequence in context: A267932 A267979 A249877 * A252516 A252523 A243858
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 18 2014
STATUS
approved

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)