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 A213696 Half the number of (n+1)X(n+1) symmetric 0..7 arrays with no 2X2 subblock summing to 14 0
 240, 105856, 342943680, 8159542628448, 1425762604012263360, 1829651398830137742302620 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 7 of A213697 LINKS EXAMPLE Some solutions for n=4 ..0..0..7..0..4....4..0..7..0..1....0..2..3..7..0....0..4..1..2..0 ..0..1..5..1..7....0..1..2..4..2....2..1..2..3..2....4..3..3..4..5 ..7..5..4..7..2....7..2..6..1..4....3..2..7..5..1....1..3..0..5..2 ..0..1..7..4..4....0..4..1..7..6....7..3..5..1..0....2..4..5..1..5 ..4..7..2..4..3....1..2..4..6..2....0..2..1..0..7....0..5..2..5..0 CROSSREFS Sequence in context: A052263 A218514 A270054 * A275459 A035281 A008696 Adjacent sequences:  A213693 A213694 A213695 * A213697 A213698 A213699 KEYWORD nonn AUTHOR R. H. Hardin Jun 18 2012 STATUS approved

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Last modified July 25 13:05 EDT 2021. Contains 346290 sequences. (Running on oeis4.)