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A297750 Number of 2Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 3 or 4 neighboring 1s. 1
1, 5, 19, 37, 71, 237, 715, 1665, 4007, 11381, 31243, 78473, 200815, 541613, 1441299, 3724657, 9704567, 25715349, 67778555, 176954073, 463516063, 1220730621, 3208289763, 8406208129, 22053755335, 57958276581, 152196865739, 399275986857 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A297749.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=7

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

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

CROSSREFS

Cf. A297749.

Sequence in context: A242589 A232057 A031093 * A285226 A146861 A068963

Adjacent sequences:  A297747 A297748 A297749 * A297751 A297752 A297753

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2018

STATUS

approved

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Last modified August 8 10:26 EDT 2022. Contains 356009 sequences. (Running on oeis4.)