A260280 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011

202, 525, 2027, 6044, 18380, 60955, 192277, 595506, 1903722, 6052530, 19003962, 60149738, 190824807, 602506945, 1904270753, 6029330442, 19066139003, 60275105360, 190686505791, 603143941550, 1907284297095, 6032465100205

Offset

1,1

Comments

Column 4 of A260284

Links

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

Formula

Empirical: a(n) = a(n-1) +24*a(n-3) +6*a(n-4) +6*a(n-5) -134*a(n-6) -100*a(n-7) -15*a(n-8) +357*a(n-9) +227*a(n-10) +71*a(n-11) -416*a(n-12) -300*a(n-13) -66*a(n-14) +222*a(n-15) +159*a(n-16) +41*a(n-17) -61*a(n-18) -31*a(n-19) +6*a(n-21) for n>26

Example

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

Crossrefs

Cf. A260284

Sequence in context: A067335 A356881 A235082 * A252993 A252987 A229640

Adjacent sequences: A260277 A260278 A260279 * A260281 A260282 A260283

Keyword

nonn

Author

R. H. Hardin, Jul 22 2015

Status

approved