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A272969 Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles triangle. 0
4, 21, 4, 8, 4, 37, 8, 44, 8, 44, 0, 34, 4, 44, 0, 48, 0, 52 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A272973.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

All solutions for n=3

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

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

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

CROSSREFS

Cf. A272973.

Sequence in context: A146342 A103896 A244955 * A327085 A083192 A225540

Adjacent sequences:  A272966 A272967 A272968 * A272970 A272971 A272972

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 2016

STATUS

approved

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Last modified September 18 16:24 EDT 2021. Contains 347528 sequences. (Running on oeis4.)