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A198649 Number of nX2 0..6 arrays with values 0..6 introduced in row major order and each element equal to at least one horizontal or vertical neighbor 1
1, 3, 14, 76, 488, 3521, 28030, 242849, 2264711, 22514016, 236355581, 2595953878, 29564752028, 346348460016, 4145325240330, 50411121219126, 620250713489362, 7696399884065815, 96085558605681094, 1204839099133770019 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A198654

LINKS

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

FORMULA

Empirical: a(n)=37*a(n-1)-502*a(n-2)+2817*a(n-3)-2399*a(n-4)-35852*a(n-5)+95494*a(n-6)+127482*a(n-7)-450424*a(n-8)-527274*a(n-9)+944990*a(n-10)+1784424*a(n-11)-456873*a(n-12)-2779579*a(n-13)-1492318*a(n-14)+1457417*a(n-15)+1939617*a(n-16)+390628*a(n-17)-559484*a(n-18)-375300*a(n-19)-62900*a(n-20)

EXAMPLE

Some solutions with all values 0 to 6 for n=7

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

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

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

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

..3..4....4..4....4..4....3..4....4..4....4..5....4..4....3..4....4..4....3..4

..5..6....5..6....5..6....5..5....5..5....4..5....5..5....5..6....5..6....5..5

..5..6....5..6....5..6....6..6....6..6....6..6....6..6....5..6....5..6....6..6

CROSSREFS

Sequence in context: A223026 A198702 A198621 * A198656 A240402 A048779

Adjacent sequences:  A198646 A198647 A198648 * A198650 A198651 A198652

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 28 2011

STATUS

approved

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Last modified December 11 03:15 EST 2016. Contains 279034 sequences.