A259423 Number of (n+1)X(4+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 or 0111

469, 7695, 123306, 1990133, 32060569, 516880938, 8331704179, 134312969201, 2165188798924, 34904319329031, 562681121125617, 9070816244710226, 146227977764091271, 2357299291195098509, 38001348653396589778

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: A349275 A250238 A234125 * A188138 A112297 A345522

Adjacent sequences: A259420 A259421 A259422 * A259424 A259425 A259426

Keyword

nonn

Author

R. H. Hardin, Jun 26 2015

Status

approved