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A198975 Number of n X n 0..5 arrays with values 0..5 introduced in row major order and no element equal to any horizontal or vertical neighbor 2
1, 4, 1835, 53082012, 30525244435834, 310387893630465965693, 55676868201599759013090066735 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A198982

LINKS

Jean-François Alcover, Table of n, a(n) for n = 1..13

EXAMPLE

Some solutions with all values from 0 to 5 for n=4

..0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1....0..1..0..1

..1..2..3..0....1..0..2..0....1..2..3..0....1..0..2..0....1..0..2..0

..4..3..2..3....0..3..4..3....4..3..2..5....0..2..1..3....3..4..5..2

..2..1..5..2....5..2..1..2....1..4..1..4....4..3..5..0....4..2..3..5

MATHEMATICA

A198982 = Cases[Import["https://oeis.org/A198982/b198982.txt", "Table"], {_, _}][[All, 2]];

a[n_] := A198982[[2 n^2 - 2 n + 1]];

Table[a[n], {n, 1, 13}] (* Jean-François Alcover, Sep 23 2019 *)

CROSSREFS

Sequence in context: A307580 A255268 A079402 * A160300 A024060 A198716

Adjacent sequences:  A198972 A198973 A198974 * A198976 A198977 A198978

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 01 2011

STATUS

approved

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Last modified October 25 09:51 EDT 2021. Contains 348239 sequences. (Running on oeis4.)