A259519 Number of (n+1)X(3+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 0101 or 1111

120, 1122, 10148, 93028, 851604, 7802386, 71482990, 654942820, 6000746068, 54980553426, 503747889040, 4615487155540, 42288462097532, 387459445851174, 3550018521891070, 32526324212267086, 298015844551102894

Offset

1,1

Comments

Column 3 of A259524

Links

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

Formula

Empirical: a(n) = 14*a(n-1) -45*a(n-2) -18*a(n-3) +249*a(n-4) -239*a(n-5) -128*a(n-6) +184*a(n-7) +10*a(n-8) -20*a(n-9) -2*a(n-10)

Example

Some solutions for n=4
..0..0..1..0....1..0..0..0....1..1..0..1....1..0..0..0....0..0..0..1
..1..1..0..0....0..1..0..0....1..1..0..1....0..1..0..1....1..0..0..0
..0..0..0..0....1..0..0..1....1..1..0..1....0..0..0..0....0..0..0..1
..0..1..0..0....1..0..0..0....0..0..0..1....0..0..0..1....1..0..0..0
..0..0..0..1....0..0..0..1....0..0..0..1....1..0..0..1....0..1..0..0

Crossrefs

Cf. A259524

Sequence in context: A265091 A371107 A371051 * A235231 A348216 A167549

Adjacent sequences: A259516 A259517 A259518 * A259520 A259521 A259522

Keyword

nonn

Author

R. H. Hardin, Jun 29 2015

Status

approved