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A297655 Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1s. 1
1, 10, 43, 140, 494, 1845, 6757, 24479, 89068, 324765, 1182996, 4307440, 15687513, 57137761, 208098949, 757896766, 2760293603, 10053139616, 36613986582, 133349718469, 485665707449, 1768816633099, 6442109942616, 23462454583677 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A297654.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -2*a(n-2) +13*a(n-3) +6*a(n-4) +12*a(n-5) +12*a(n-6)

EXAMPLE

Some solutions for n=7

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

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

CROSSREFS

Cf. A297654.

Sequence in context: A211070 A251936 A187673 * A198695 A227728 A003866

Adjacent sequences:  A297652 A297653 A297654 * A297656 A297657 A297658

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 02 2018

STATUS

approved

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Last modified April 7 15:03 EDT 2020. Contains 333305 sequences. (Running on oeis4.)