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A301963 Number of nX7 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
21, 35, 132, 443, 1803, 7795, 33860, 148299, 646838, 2827081, 12348295, 53946658, 235669276, 1029543928, 4497666250, 19648472006, 85836276153, 374983965881, 1638153628134, 7156431645355, 31263560215566, 136577871103739 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A301964.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +13*a(n-2) +13*a(n-3) -19*a(n-4) -27*a(n-5) +16*a(n-6) +32*a(n-7) -23*a(n-8) -43*a(n-9) +45*a(n-10) +11*a(n-11) -29*a(n-12) +13*a(n-13) -2*a(n-14) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301964.

Sequence in context: A246157 A301789 A244166 * A219919 A219215 A342719

Adjacent sequences:  A301960 A301961 A301962 * A301964 A301965 A301966

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 29 2018

STATUS

approved

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Last modified June 15 12:29 EDT 2021. Contains 345048 sequences. (Running on oeis4.)