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 A208094 Number of n X 4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors). 2
 1, 5, 377, 169064, 235862938, 746823293346, 4493602584256529, 45881957995776221396, 734971289403287420883126, 17434398033181126785548889533, 585880828202059360820577364423099, 26929433656271781956071918468836389588, 1645382407173932261418519657416983542506695 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Andrew Howroyd, Table of n, a(n) for n = 0..100 EXAMPLE Some solutions for n=4 ..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1 ..0..1..0..2....0..1..0..1....0..1..2..1....0..1..0..1....0..1..0..2 ..2..1..0..1....2..1..0..2....0..1..0..1....0..2..0..1....2..1..0..1 ..0..1..2..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..2 CROSSREFS Column 4 of A208096. Sequence in context: A072172 A278364 A214008 * A273397 A261433 A206386 Adjacent sequences: A208091 A208092 A208093 * A208095 A208096 A208097 KEYWORD nonn AUTHOR R. H. Hardin, Feb 23 2012 EXTENSIONS a(0)=1 prepended and terms a(8) and beyond from Andrew Howroyd, May 17 2020 STATUS approved

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Last modified May 27 06:20 EDT 2024. Contains 372848 sequences. (Running on oeis4.)