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A251254 Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge 1
84, 446, 1770, 9130, 38332, 192442, 836546, 4112126, 18298862, 88585834, 400512170, 1918066656, 8765618868, 41663142968, 191790556024, 906821509892, 4194988138126, 19763051033382, 91728816380528, 431069210118044 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A251258

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +21*a(n-2) -115*a(n-3) -95*a(n-4) +706*a(n-5) +69*a(n-6) -1492*a(n-7) +208*a(n-8) +987*a(n-9) -228*a(n-10) -111*a(n-11) +28*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A189543 A251300 A251293 * A349682 A064198 A329935

Adjacent sequences: A251251 A251252 A251253 * A251255 A251256 A251257

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified January 31 17:33 EST 2023. Contains 359979 sequences. (Running on oeis4.)