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A301904 Number of nX6 0..1 arrays with every element equal to 0, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
1, 6, 7, 40, 92, 532, 1999, 10150, 46226, 234484, 1167106, 6013755, 31027951, 161979950, 848039052, 4458470286, 23481316334, 123866264459, 653972874084, 3454977358732, 18260006314624, 96532215568355, 510408646716334 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A301906.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +22*a(n-2) -23*a(n-3) -132*a(n-4) -102*a(n-5) -188*a(n-6) +202*a(n-7) +1241*a(n-8) +242*a(n-9) -1952*a(n-10) -662*a(n-11) +1583*a(n-12) +498*a(n-13) -772*a(n-14) -182*a(n-15) +220*a(n-16) +31*a(n-17) -22*a(n-18) -7*a(n-19) +a(n-20) for n>21

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301906.

Sequence in context: A248850 A294728 A219212 * A152119 A041080 A042091

Adjacent sequences:  A301901 A301902 A301903 * A301905 A301906 A301907

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 28 2018

STATUS

approved

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Last modified March 21 07:23 EDT 2019. Contains 321367 sequences. (Running on oeis4.)