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A298142 Number of nX4 0..1 arrays with every element equal to 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero. 2
0, 1, 2, 8, 13, 27, 43, 104, 220, 478, 988, 2085, 4451, 9505, 20311, 43151, 91982, 195977, 418524, 892675, 1904782, 4063008, 8670687, 18504003, 39492308, 84283520, 179879444, 383917687, 819414074, 1748947386, 3732920854, 7967557278 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 4 of A298146.

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) -4*a(n-3) +3*a(n-4) -10*a(n-6) -2*a(n-7) -4*a(n-8) +11*a(n-9) +8*a(n-10) -2*a(n-11) +2*a(n-12) -2*a(n-13) -2*a(n-14) +12*a(n-15) -a(n-16) -6*a(n-17) +a(n-18) -4*a(n-19) +a(n-21) for n>27

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A298146.

Sequence in context: A196024 A037382 A297810 * A095825 A106359 A257036

Adjacent sequences:  A298139 A298140 A298141 * A298143 A298144 A298145

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 13 2018

STATUS

approved

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Last modified October 17 01:56 EDT 2019. Contains 328105 sequences. (Running on oeis4.)