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A259423 Number of (n+1)X(4+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 or 0111 1
469, 7695, 123306, 1990133, 32060569, 516880938, 8331704179, 134312969201, 2165188798924, 34904319329031, 562681121125617, 9070816244710226, 146227977764091271, 2357299291195098509, 38001348653396589778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A259427

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) +34*a(n-2) -1078*a(n-3) -384*a(n-4) +17595*a(n-5) -3702*a(n-6) -104436*a(n-7) +47348*a(n-8) +254812*a(n-9) -155015*a(n-10) -240597*a(n-11) +170095*a(n-12) +72147*a(n-13) -60513*a(n-14) -2266*a(n-15) +6147*a(n-16) -594*a(n-17) -142*a(n-18) +25*a(n-19) -a(n-20)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Cf. A259427

Sequence in context: A045305 A250238 A234125 * A188138 A112297 A345522

Adjacent sequences:  A259420 A259421 A259422 * A259424 A259425 A259426

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 26 2015

STATUS

approved

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Last modified October 20 10:43 EDT 2021. Contains 348100 sequences. (Running on oeis4.)