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A198521 Number of n X n 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 0
1, 15, 16714, 1084539825, 1814002928583853, 72341858272434900016248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A198528

LINKS

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

EXAMPLE

Some solutions for n=4

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

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

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

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

CROSSREFS

Sequence in context: A282945 A112614 A238634 * A212924 A068732 A174304

Adjacent sequences:  A198518 A198519 A198520 * A198522 A198523 A198524

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 26 2011

STATUS

approved

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Last modified November 17 11:02 EST 2019. Contains 329226 sequences. (Running on oeis4.)