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 A206390 Number of n X n 0..5 arrays with no element equal to another within a city block distance of two, and new values 0..5 introduced in row major order. 0
 1, 1, 26, 1931, 170796, 21983256, 3889732730, 998388746378 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Diagonal of A206396. LINKS Table of n, a(n) for n=1..8. EXAMPLE Some solutions for n=4 ..0..1..2..0....0..1..2..3....0..1..2..0....0..1..2..3....0..1..2..3 ..2..3..4..1....3..4..5..0....2..3..4..5....2..3..4..5....4..3..5..4 ..1..5..0..2....1..0..3..1....4..5..0..1....4..5..0..1....5..2..0..1 ..4..2..3..4....2..5..4..2....0..1..2..3....3..1..2..3....0..1..4..3 CROSSREFS Cf. A206396. Sequence in context: A054853 A257947 A245929 * A268089 A173949 A266030 Adjacent sequences: A206387 A206388 A206389 * A206391 A206392 A206393 KEYWORD nonn AUTHOR R. H. Hardin Feb 07 2012 STATUS approved

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Last modified December 4 14:48 EST 2023. Contains 367563 sequences. (Running on oeis4.)