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A302960 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 29, 154, 833, 4527, 24602, 133757, 727293, 3954552, 21502829, 116922075, 635766762, 3457004649, 18797598113, 102212699104, 555785781065, 3022108386151, 16432841038810, 89354263698021, 485867567617493 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A302965.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -7*a(n-2) -56*a(n-4) +64*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302965.

Sequence in context: A272373 A273247 A302260 * A273300 A300467 A326100

Adjacent sequences:  A302957 A302958 A302959 * A302961 A302962 A302963

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 2018

STATUS

approved

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Last modified August 5 07:54 EDT 2021. Contains 346464 sequences. (Running on oeis4.)