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A231953 Number of (n+1)X(4+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero 1
236, 7756, 220472, 6517534, 193955142, 5764579644, 171279257338, 5089308419738, 151223178459482, 4493424899719612, 133516942705659428, 3967302181683700740, 117883817779236879238, 3502781954945577038092, 104081133818878131585006 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A231957

LINKS

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

FORMULA

Empirical: a(n) = 27*a(n-1) +43*a(n-2) +979*a(n-3) +3959*a(n-4) +5024*a(n-5) +13587*a(n-6) -30380*a(n-7) -229403*a(n-8) -225428*a(n-9) +119690*a(n-10) +600710*a(n-11) +1399515*a(n-12) +477099*a(n-13) -2452480*a(n-14) -2052385*a(n-15) +1138184*a(n-16) +1422082*a(n-17) +42409*a(n-18) -158339*a(n-19) -56561*a(n-20) -79639*a(n-21) -16514*a(n-22) +4502*a(n-23) -496*a(n-24) +1440*a(n-25) +720*a(n-26)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A218649 A285156 A242148 * A233178 A220760 A218179

Adjacent sequences:  A231950 A231951 A231952 * A231954 A231955 A231956

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 15 2013

STATUS

approved

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Last modified September 18 16:56 EDT 2021. Contains 347532 sequences. (Running on oeis4.)