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A303103 Number of 3Xn 0..1 arrays with every element equal to 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
0, 11, 77, 431, 2913, 19393, 128921, 857789, 5706297, 37961366, 252538085, 1680012401, 11176296913, 74350419884, 494616846377, 3290443118074, 21889703025083, 145621450295042, 968748034460686, 6444605189965405 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A303102.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Cf. A303102.

Sequence in context: A325733 A059625 A023010 * A258459 A320547 A022639

Adjacent sequences:  A303100 A303101 A303102 * A303104 A303105 A303106

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 18 2018

STATUS

approved

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Last modified January 17 11:20 EST 2022. Contains 350390 sequences. (Running on oeis4.)