A260136 Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111

944, 3928, 22522, 85048, 365308, 1799114, 7839850, 33893514, 155470816, 697051946, 3073153820, 13791352932, 61881071698, 275443687654, 1230459293574, 5508072254348, 24593824347286, 109832226922584, 491024767206608

Offset

1,1

Comments

Column 6 of A260138

Links

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

Formula

Empirical: a(n) = a(n-1) +3*a(n-2) +61*a(n-3) +47*a(n-4) -60*a(n-5) -990*a(n-6) -1180*a(n-7) +352*a(n-8) +8249*a(n-9) +7603*a(n-10) -2855*a(n-11) -30388*a(n-12) -20354*a(n-13) +5185*a(n-14) +61744*a(n-15) +24167*a(n-16) -8563*a(n-17) -72780*a(n-18) -8588*a(n-19) +15051*a(n-20) +61538*a(n-21) -6778*a(n-22) -13766*a(n-23) -35716*a(n-24) +1294*a(n-25) +5880*a(n-26) +10338*a(n-27) +1680*a(n-28) -1116*a(n-30) for n>32

Example

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

Crossrefs

Cf. A260138

Sequence in context: A268268 A106431 A234485 * A215838 A145493 A271765

Adjacent sequences: A260133 A260134 A260135 * A260137 A260138 A260139

Keyword

nonn

Author

R. H. Hardin, Jul 17 2015

Status

approved