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A302166 Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
8, 10, 17, 29, 51, 109, 206, 407, 791, 1584, 3104, 6165, 12131, 24059, 47443, 93958, 185498, 367087, 725156, 1434386, 2834565, 5605574, 11079494, 21907412, 43304842, 85620318, 169257166, 334632998, 661534245, 1307869617, 2585565413, 5111662053 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A302163.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +8*a(n-4) -4*a(n-5) -4*a(n-6) -a(n-7) -22*a(n-8) +a(n-9) +5*a(n-10) +2*a(n-11) +28*a(n-12) +6*a(n-13) -3*a(n-14) -3*a(n-15) -17*a(n-16) -4*a(n-17) +2*a(n-18) +2*a(n-19) +4*a(n-20) -a(n-22) for n>23

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A302163.

Sequence in context: A049510 A121846 A059094 * A287270 A299988 A143617

Adjacent sequences:  A302163 A302164 A302165 * A302167 A302168 A302169

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 02 2018

STATUS

approved

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Last modified June 7 02:48 EDT 2020. Contains 334836 sequences. (Running on oeis4.)