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A231952 Number of (n+1)X(3+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero 1
64, 1034, 14842, 220472, 3292876, 49124582, 732691918, 10928482748, 163005613290, 2431334781688, 36264925895498, 540914768944926, 8068092919700682, 120340813466844560, 1794960906023880032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A231957

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) +6*a(n-2) +103*a(n-3) +170*a(n-4) -39*a(n-5) -13*a(n-6) -99*a(n-7) -375*a(n-8) -29*a(n-9) +181*a(n-10) +18*a(n-11) -24*a(n-12)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A000768 A230972 A232958 * A223018 A221247 A280603

Adjacent sequences:  A231949 A231950 A231951 * A231953 A231954 A231955

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 15 2013

STATUS

approved

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Last modified September 24 22:49 EDT 2022. Contains 356949 sequences. (Running on oeis4.)