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A317234 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 1
8, 24, 60, 168, 674, 2432, 8255, 29245, 105103, 371011, 1309368, 4655316, 16519210, 58492609, 207432479, 735833616, 2608622433, 9248841123, 32798084620, 116297139395, 412355808249, 1462162440452, 5184649702920, 18383824165115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A317238.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +7*a(n-2) +11*a(n-3) -30*a(n-4) -105*a(n-5) -90*a(n-6) +243*a(n-7) +519*a(n-8) +69*a(n-9) -377*a(n-10) +294*a(n-11) +118*a(n-12) -3127*a(n-13) -3198*a(n-14) +2938*a(n-15) +4164*a(n-16) -2745*a(n-17) -4385*a(n-18) +8169*a(n-19) +6852*a(n-20) -8746*a(n-21) +621*a(n-22) +29311*a(n-23) +38056*a(n-24) -3386*a(n-25) -27694*a(n-26) -38080*a(n-27) -52553*a(n-28) -66971*a(n-29) -20347*a(n-30) +7680*a(n-31) -16042*a(n-32) -10748*a(n-33) +50135*a(n-34) +71155*a(n-35) +74550*a(n-36) +91045*a(n-37) +80291*a(n-38) +34495*a(n-39) +5003*a(n-40) -35815*a(n-41) -82100*a(n-42) -76688*a(n-43) -51319*a(n-44) -35830*a(n-45) -2754*a(n-46) +40983*a(n-47) +33705*a(n-48) +3308*a(n-49) -7293*a(n-50) -3707*a(n-51) -2336*a(n-52) +2858*a(n-53) +5853*a(n-54) +1546*a(n-55) -1048*a(n-56) +133*a(n-57) +540*a(n-58) -801*a(n-59) -792*a(n-60) -190*a(n-61) +18*a(n-62) +4*a(n-63) +52*a(n-64) +48*a(n-65) for n>67

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317238.

Sequence in context: A129959 A256533 A177719 * A049724 A060602 A066605

Adjacent sequences:  A317231 A317232 A317233 * A317235 A317236 A317237

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 24 2018

STATUS

approved

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Last modified September 17 16:50 EDT 2021. Contains 347487 sequences. (Running on oeis4.)