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A198702 Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor 1
1, 3, 14, 76, 488, 3508, 27422, 227045, 1950662, 17146596, 152812056, 1373072354, 12397256874, 112250461201, 1018054465392, 9242194131044, 83950882529364, 762814946316712, 6932614771099750, 63012101072493525, 572768961745981914 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A198708

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 17*a(n-1) -80*a(n-2) +37*a(n-3) +349*a(n-4) -60*a(n-5) -729*a(n-6) -553*a(n-7) +572*a(n-8) +783*a(n-9) +139*a(n-10) -304*a(n-11) -170*a(n-12)

EXAMPLE

All solutions with all values 0 to 4 for n=5

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

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

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

..3..3....3..3....3..3....3..4....2..3....2..3....3..4....3..4

..4..4....4..4....4..4....3..4....4..4....4..4....3..4....3..4

CROSSREFS

Sequence in context: A100937 A223026 A353253 * A198621 A198649 A198656

Adjacent sequences: A198699 A198700 A198701 * A198703 A198704 A198705

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 29 2011

STATUS

approved

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Last modified December 9 00:20 EST 2022. Contains 358698 sequences. (Running on oeis4.)