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A302473 Number of 3Xn 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 2
0, 11, 49, 203, 955, 4556, 21843, 103319, 491073, 2332753, 11082938, 52648987, 250106679, 1188163911, 5644397853, 26814116700, 127381683511, 605134192403, 2874722191055, 13656526930929, 64876076932622, 308197362006435 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A302472.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +17*a(n-2) +15*a(n-3) -33*a(n-4) -62*a(n-5) -148*a(n-6) -116*a(n-7) +343*a(n-8) +429*a(n-9) +269*a(n-10) +191*a(n-11) -415*a(n-12) -534*a(n-13) -468*a(n-14) -436*a(n-15) -132*a(n-16) -72*a(n-17) -8*a(n-18) +8*a(n-19) for n>21

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A302472.

Sequence in context: A295420 A003063 A124857 * A126398 A159486 A284857

Adjacent sequences:  A302470 A302471 A302472 * A302474 A302475 A302476

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 08 2018

STATUS

approved

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Last modified June 15 19:31 EDT 2021. Contains 345049 sequences. (Running on oeis4.)