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A297982 Number of nX4 0..1 arrays with every element equal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero. 1
1, 17, 5, 15, 23, 43, 79, 184, 380, 830, 1776, 3815, 8227, 17737, 38335, 82673, 178600, 385419, 832806, 1798455, 3885410, 8392102, 18129621, 39164405, 84609476, 182786176, 394886142, 853110431, 1843063212, 3981796702, 8602359868 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A297986.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +2*a(n-2) -3*a(n-3) +2*a(n-4) -3*a(n-5) -9*a(n-6) -3*a(n-7) -3*a(n-8) +17*a(n-9) +13*a(n-10) +11*a(n-11) -5*a(n-12) -14*a(n-13) -a(n-14) +7*a(n-15) +10*a(n-16) -8*a(n-17) -12*a(n-18) -3*a(n-19) -5*a(n-20) +3*a(n-21) +2*a(n-22) for n>28

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297986.

Sequence in context: A196924 A109215 A254070 * A298631 A338559 A243933

Adjacent sequences:  A297979 A297980 A297981 * A297983 A297984 A297985

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2018

STATUS

approved

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Last modified July 27 20:33 EDT 2021. Contains 346308 sequences. (Running on oeis4.)