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

1, 4, 1835, 53082012, 30525244435834, 310387893630465965693, 55676868201599759013090066735

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