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A198701 Number of n X n 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor 0
0, 3, 185, 322230, 10239497407, 4285681886701131 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A198708

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

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

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

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

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

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

CROSSREFS

Sequence in context: A042779 A103503 A203562 * A157561 A157590 A157236

Adjacent sequences: A198698 A198699 A198700 * A198702 A198703 A198704

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 29 2011

STATUS

approved

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Last modified December 1 14:52 EST 2022. Contains 358468 sequences. (Running on oeis4.)