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A297884 Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero. 1
4, 13, 20, 26, 41, 67, 99, 156, 255, 406, 654, 1075, 1765, 2903, 4816, 8015, 13356, 22334, 37441, 62847, 105663, 177912, 299855, 505826, 853990, 1442723, 2438617, 4123939, 6976756, 11806935, 19986864, 33842134, 57313801, 97081475, 164466875 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A297889.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -2*a(n-2) +2*a(n-3) -6*a(n-4) +2*a(n-5) +5*a(n-7) -a(n-8) -2*a(n-10) for n>11

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297889.

Sequence in context: A119048 A241264 A066993 * A298289 A298489 A299182

Adjacent sequences:  A297881 A297882 A297883 * A297885 A297886 A297887

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 07 2018

STATUS

approved

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Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)