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A281950 Number of nX3 0..1 arrays with no element unequal to more than four of its king-move neighbors and with new values introduced in order 0 sequentially upwards. 1
4, 30, 133, 587, 2559, 11251, 49293, 216274, 948407, 4159753, 18243646, 80014078, 350927303, 1539109339, 6750270615, 29605549628, 129844926004, 569477896562, 2497633716174, 10954199079473, 48043264384017, 210709631957358 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A281955.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 3*a(n-1) +7*a(n-2) -3*a(n-3) -5*a(n-4) +2*a(n-5) +2*a(n-6) -12*a(n-7) +2*a(n-8) -3*a(n-10) for n>12

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281955.

Sequence in context: A027789 A130424 A005715 * A316178 A305764 A317113

Adjacent sequences:  A281947 A281948 A281949 * A281951 A281952 A281953

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 03 2017

STATUS

approved

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Last modified April 24 18:03 EDT 2019. Contains 322430 sequences. (Running on oeis4.)