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 A223117 Number of 4Xn 0..2 arrays with exactly floor(4Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
 0, 184, 6676, 244607, 9329085, 361530918, 14237206760, 566959827679, 22771337178098, 920732664014184, 37428247719900736, 1528116180858713458, 62615475463419517018, 2573537658832757981728, 106050487362790924033404 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 4 of A223114 LINKS R. H. Hardin, Table of n, a(n) for n = 1..18 EXAMPLE Some solutions for n=3 ..0..1..1....0..1..0....0..1..2....0..1..0....0..1..2....0..1..0....0..0..1 ..2..1..2....0..1..0....1..1..0....0..2..1....1..2..0....1..1..2....1..0..1 ..2..0..2....1..1..1....0..1..0....0..0..1....1..0..1....0..0..2....1..2..2 ..1..0..0....1..1..2....2..1..1....2..0..1....1..2..1....1..0..1....2..0..1 CROSSREFS Sequence in context: A121733 A235250 A221931 * A221782 A296780 A035831 Adjacent sequences: A223114 A223115 A223116 * A223118 A223119 A223120 KEYWORD nonn AUTHOR R. H. Hardin Mar 14 2013 STATUS approved

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Last modified May 31 12:40 EDT 2023. Contains 363066 sequences. (Running on oeis4.)