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A301821 Number of nX6 0..1 arrays with every element equal to 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
5, 50, 278, 1351, 6501, 31061, 147954, 705180, 3364845, 16066957, 76746541, 366661633, 1751917453, 8371075480, 39999735173, 191133225006, 913306286525, 4364124497569, 20853452368747, 99645765475503, 476145569567504 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A301823.

LINKS

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

FORMULA

Empirical: a(n) = 17*a(n-1) -130*a(n-2) +609*a(n-3) -1982*a(n-4) +4783*a(n-5) -8877*a(n-6) +12928*a(n-7) -14910*a(n-8) +13627*a(n-9) -9800*a(n-10) +5461*a(n-11) -2298*a(n-12) +701*a(n-13) -145*a(n-14) +18*a(n-15) -a(n-16) for n>17

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301823.

Sequence in context: A274064 A302695 A064054 * A301997 A227883 A227261

Adjacent sequences:  A301818 A301819 A301820 * A301822 A301823 A301824

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 27 2018

STATUS

approved

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Last modified October 1 08:39 EDT 2020. Contains 337442 sequences. (Running on oeis4.)