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 A265213 Number of (2n-1)X2 0..4n-3 arrays with upper left zero and lower right 4n-3 and each element differing from its horizontal and vertical neighbors by a power of three. 1
 1, 16, 1958, 654833, 112227310, 32488774453, 7717657825137, 4728240318574186, 2979856311196634505, 2024001459953859821039, 1213770752826839089178744, 689849091376425076726628410, 380422604546957185646459036805 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A265218 (nonzero terms). LINKS R. H. Hardin, Table of n, a(n) for n = 1..105 EXAMPLE Some solutions for n=3 ..0..1....0..1....0..9....0..3....0..3....0..1....0..9....0..9....0..3....0..9 ..1..2....1..0....3..6....1..4....9..0....1..2....3..6....3..6....3..0....9..0 ..0..3....0..9....0..9....0..1....0..3....2..3....6..9....6..3....4..3....6..3 ..9..0....9..8....9..0....9..0....1..0....3..6....5..6....7..6....3..0....9..6 ..8..9....6..9....8..9....8..9....0..9....0..9....8..9....8..9....0..9....0..9 CROSSREFS Cf. A265218. Sequence in context: A160306 A167000 A075413 * A176886 A159389 A291828 Adjacent sequences:  A265210 A265211 A265212 * A265214 A265215 A265216 KEYWORD nonn AUTHOR R. H. Hardin, Dec 05 2015 STATUS approved

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Last modified August 5 15:36 EDT 2021. Contains 346476 sequences. (Running on oeis4.)