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A298448 Number of nX2 0..1 arrays with every element equal to 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 6
1, 4, 4, 16, 48, 88, 240, 704, 1600, 4032, 11072, 27392, 68608, 180736, 459776, 1160704, 2999296, 7682048, 19525632, 50081792, 128339968, 327434240, 837861376, 2145583104, 5483266048, 14023229440, 35888758784, 91776090112, 234707222528 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A298454.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +8*a(n-3) -8*a(n-4) -8*a(n-5)

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A298454.

Sequence in context: A222104 A257613 A223202 * A222144 A342817 A107382

Adjacent sequences:  A298445 A298446 A298447 * A298449 A298450 A298451

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 19 2018

STATUS

approved

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Last modified October 16 06:11 EDT 2021. Contains 348035 sequences. (Running on oeis4.)