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A306049 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero. 1
8, 49, 142, 458, 1962, 6604, 22446, 86464, 311891, 1100642, 4051876, 14751188, 52994208, 192694281, 700643032, 2533737542, 9188792804, 33358655064, 120883510481, 438255796512, 1589816384928, 5764235810314, 20899418376356 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A306053.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -17*a(n-2) +39*a(n-3) -133*a(n-4) +234*a(n-5) -178*a(n-6) +296*a(n-7) -581*a(n-8) +168*a(n-9) +290*a(n-10) +137*a(n-11) -67*a(n-12) -620*a(n-13) +433*a(n-14) -15*a(n-15) +166*a(n-16) -206*a(n-17) +44*a(n-18) -6*a(n-19) +14*a(n-20) -4*a(n-21) for n>25

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A306053.

Sequence in context: A272713 A316285 A018200 * A317226 A329051 A295777

Adjacent sequences: A306046 A306047 A306048 * A306050 A306051 A306052

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 18 2018

STATUS

approved

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Last modified January 28 07:13 EST 2023. Contains 359850 sequences. (Running on oeis4.)