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A198656 Number of nX2 0..7 arrays with values 0..7 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, 242883, 2267306, 22621072, 239604079, 2677734762, 31381450817, 383270472363, 4847901589642, 63125725801101, 841517900517550, 11429291342102135, 157506922063918536, 2195111769933116471 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A198661

LINKS

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

FORMULA

Empirical: a(n) = 50*a(n-1) -973*a(n-2) +8874*a(n-3) -29927*a(n-4) -92230*a(n-5) +939984*a(n-6) -1157338*a(n-7) -7025352*a(n-8) +14473974*a(n-9) +29278108*a(n-10) -54017762*a(n-11) -108264239*a(n-12) +78120984*a(n-13) +276328733*a(n-14) +56831952*a(n-15) -336850101*a(n-16) -307076936*a(n-17) +88644128*a(n-18) +275952224*a(n-19) +124163560*a(n-20) -45062112*a(n-21) -62248400*a(n-22) -20707200*a(n-23) -2210000*a(n-24)

EXAMPLE

Some solutions with all values 0 to 7 for n=8

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

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

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

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

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

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

..6..7....5..6....6..7....5..6....6..6....6..7....6..7....6..6....5..6....5..6

..6..7....7..7....6..7....7..7....7..7....6..7....6..7....7..7....7..7....7..7

CROSSREFS

Sequence in context: A198702 A198621 A198649 * A240402 A048779 A052186

Adjacent sequences:  A198653 A198654 A198655 * A198657 A198658 A198659

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 28 2011

STATUS

approved

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Last modified April 6 22:23 EDT 2020. Contains 333291 sequences. (Running on oeis4.)