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A282964 Number of nX3 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements. 1
0, 5, 38, 309, 2012, 12160, 70722, 395223, 2150350, 11454117, 59948615, 309270883, 1576188831, 7949681739, 39734943909, 197045928939, 970369807931, 4749163345697, 23114719065210, 111941467863241, 539671083601641 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A282969.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +24*a(n-2) +7*a(n-3) -267*a(n-4) -870*a(n-5) -639*a(n-6) +3738*a(n-7) +16311*a(n-8) +37667*a(n-9) +61221*a(n-10) +74643*a(n-11) +67169*a(n-12) +38199*a(n-13) -30*a(n-14) -29442*a(n-15) -38079*a(n-16) -27174*a(n-17) -8230*a(n-18) +6285*a(n-19) +10539*a(n-20) +6972*a(n-21) +1605*a(n-22) -1506*a(n-23) -1799*a(n-24) -753*a(n-25) +57*a(n-26) +265*a(n-27) +111*a(n-28) +3*a(n-29) -24*a(n-30) -6*a(n-31) +a(n-33)
EXAMPLE
Some solutions for n=4
..0..0..1. .0..0..1. .1..1..0. .0..1..1. .1..1..1. .1..0..1. .1..1..1
..1..1..0. .0..1..0. .0..1..0. .0..0..1. .0..0..1. .1..0..1. .0..0..1
..0..0..1. .0..1..0. .1..0..1. .0..1..0. .1..0..0. .0..0..1. .0..0..0
..1..1..0. .0..1..0. .0..1..0. .0..0..1. .1..0..0. .0..1..0. .0..1..1
CROSSREFS
Cf. A282969.
Sequence in context: A110079 A110082 A073508 * A357163 A357224 A247773
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 25 2017
STATUS
approved

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Last modified April 13 12:32 EDT 2024. Contains 371641 sequences. (Running on oeis4.)