A261707 Number of (n+2) X (4+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.

338, 462, 662, 675, 734, 1443, 1416, 1486, 2556, 3004, 3232, 4244, 7152, 6998, 7632, 14546, 15458, 16486, 25442, 35466, 36164, 44018, 77572, 78884, 85814, 147948, 177648, 185492, 258962, 398694, 405494, 472392, 818694, 898300, 962918, 1509474

Offset

1,1

Comments

Column 4 of A261709.

Links

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

Formula

Empirical: a(n) = 3*a(n-7) +5*a(n-10) +a(n-13) -a(n-14) -a(n-17) -2*a(n-21) for n>27.

Example

Some solutions for n=7
..0..0..0..0..1..0....0..1..0..1..0..0....0..1..0..0..0..0....1..0..0..0..0..1
..0..0..0..1..0..0....1..0..0..0..0..0....0..0..0..0..0..1....0..1..0..0..1..0
..1..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..1..0....1..0..0..0..0..0
..0..0..0..0..0..0....0..0..0..1..0..0....0..1..0..0..0..0....0..0..0..0..0..0
..0..0..0..1..0..0....0..0..1..0..0..0....1..0..0..0..0..0....0..0..0..1..0..0
..0..0..1..0..0..0....0..0..0..0..0..0....0..0..0..0..1..0....0..0..1..0..0..0
..0..0..0..0..0..0....0..0..0..0..0..1....1..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..0....0..0..0..0..0..1
..0..1..0..0..1..0....0..1..0..0..0..1....0..0..0..0..0..0....1..0..1..0..1..0

Crossrefs

Cf. A261709.

Sequence in context: A234625 A226539 A066478 * A202443 A188213 A250802

Adjacent sequences: A261704 A261705 A261706 * A261708 A261709 A261710

Keyword

nonn

Author

R. H. Hardin, Aug 28 2015

Status

approved