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A302622 Number of nX7 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
64, 361, 286, 1051, 5771, 30536, 159831, 851266, 4471550, 23596546, 124656067, 657560234, 3471424786, 18324471950, 96718090476, 510535952469, 2694818516619, 14224352597910, 75082608827730, 396318019638887, 2091938313164910 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A302623.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +8*a(n-2) +30*a(n-3) -30*a(n-4) -20*a(n-5) -315*a(n-6) -251*a(n-7) +113*a(n-8) +2023*a(n-9) +132*a(n-10) -209*a(n-11) -4888*a(n-12) +717*a(n-13) +3759*a(n-14) +13504*a(n-15) -13849*a(n-16) -1791*a(n-17) -18677*a(n-18) -7031*a(n-19) +3966*a(n-20) +53587*a(n-21) +541*a(n-22) -65*a(n-23) -35490*a(n-24) -28553*a(n-25) +22659*a(n-26) +13817*a(n-27) +6815*a(n-28) -11700*a(n-29) -17*a(n-30) -3101*a(n-31) +5982*a(n-32) -192*a(n-33) -1908*a(n-34) +432*a(n-35) for n>43

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302623.

Sequence in context: A300313 A137739 A281468 * A302414 A303181 A017486

Adjacent sequences:  A302619 A302620 A302621 * A302623 A302624 A302625

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 10 2018

STATUS

approved

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Last modified August 11 00:32 EDT 2020. Contains 336403 sequences. (Running on oeis4.)