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 A208169 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward neighbors 1
 1, 13, 8469, 99752346, 16567902881244, 38625516979536823947, 1263976383376771173195964686, 580579239138791881884932674640711196, 3743190521310525744113304412007474906812935048 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A208175 LINKS R. H. Hardin, Table of n, a(n) for n = 1..10 EXAMPLE Some solutions for n=4 ..0..0..0..0....0..0..0..1....0..1..0..0....0..0..0..1....0..0..0..0 ..0..1..1..2....1..1..0..0....2..2..1..2....1..0..1..2....1..1..1..1 ..1..0..1..3....2..3..3..0....1..1..3..2....2..2..1..0....2..1..2..3 ..1..3..3..1....0..2..1..3....0..3..0..0....0..3..0..1....0..1..2..0 CROSSREFS Sequence in context: A013524 A060887 A020521 * A205162 A122429 A173506 Adjacent sequences:  A208166 A208167 A208168 * A208170 A208171 A208172 KEYWORD nonn AUTHOR R. H. Hardin Feb 24 2012 STATUS approved

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Last modified January 22 16:37 EST 2020. Contains 331152 sequences. (Running on oeis4.)