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A317379 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 1
8, 9, 36, 123, 414, 1580, 5704, 20162, 72715, 262549, 944628, 3399508, 12242821, 44087164, 158739670, 571576721, 2058142185, 7410913041, 26684956759, 96086522975, 345986123562, 1245818108353, 4485910314885, 16152754437159 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A317383.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +6*a(n-2) +4*a(n-3) -6*a(n-4) -32*a(n-5) -43*a(n-6) +7*a(n-7) +82*a(n-8) +59*a(n-9) +16*a(n-10) +10*a(n-11) -62*a(n-12) -69*a(n-13) -24*a(n-14) -7*a(n-15) +24*a(n-16) +34*a(n-17) +8*a(n-18) -8*a(n-19) for n>23

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317383.

Sequence in context: A129548 A322797 A075079 * A298665 A284822 A222354

Adjacent sequences:  A317376 A317377 A317378 * A317380 A317381 A317382

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 26 2018

STATUS

approved

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Last modified October 20 22:22 EDT 2021. Contains 348119 sequences. (Running on oeis4.)