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A316416 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 5, 6 or 8 king-move adjacent elements, with upper left element zero. 1
8, 9, 27, 93, 287, 1009, 3496, 11962, 41160, 142076, 489828, 1688040, 5819002, 20061466, 69159010, 238412640, 821894454, 2833376300, 9767673768, 33672696882, 116082018872, 400176917418, 1379555120878, 4755827350460, 16395063986690 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A316420.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +6*a(n-2) -a(n-3) -a(n-4) -17*a(n-5) -40*a(n-6) +16*a(n-7) +42*a(n-8) +13*a(n-9) +39*a(n-10) +7*a(n-11) -47*a(n-12) -20*a(n-13) -4*a(n-14) -12*a(n-15) +10*a(n-16) +20*a(n-17) -4*a(n-18) -8*a(n-19) for n>23
EXAMPLE
Some solutions for n=5
..0..1..0..0. .0..0..1..1. .0..0..0..0. .0..0..0..0. .0..1..1..0
..0..0..0..1. .0..1..0..1. .1..0..0..0. .0..0..0..0. .0..1..1..0
..0..0..0..0. .0..0..1..0. .0..0..0..0. .0..0..0..0. .0..0..0..0
..1..0..0..0. .0..0..0..0. .1..0..0..0. .0..0..1..0. .0..0..0..0
..0..0..0..0. .0..1..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..0
CROSSREFS
Cf. A316420.
Sequence in context: A217843 A139753 A046874 * A303262 A225364 A304922
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 02 2018
STATUS
approved

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Last modified May 26 20:04 EDT 2024. Contains 372844 sequences. (Running on oeis4.)