A260013 Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010101 or 01010101

828, 2738, 18356, 84050, 294336, 1210568, 5674360, 24724512, 101249348, 428893472, 1872332800, 8043685448, 34055537824, 145297154312, 624337715924, 2672815345922, 11402714613024, 48733917928200, 208637923678800

Offset

1,1

Comments

Column 6 of A260015

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +20*a(n-3) +125*a(n-4) -59*a(n-5) +18*a(n-6) -729*a(n-7) -3826*a(n-8) +489*a(n-9) +532*a(n-10) +7403*a(n-11) +38557*a(n-12) -313*a(n-13) -3705*a(n-14) -29029*a(n-15) -166609*a(n-16) -5164*a(n-17) +1596*a(n-18) +44987*a(n-19) +326610*a(n-20) +1811*a(n-21) +7895*a(n-22) -34542*a(n-23) -295044*a(n-24) +7102*a(n-25) -5217*a(n-26) +14136*a(n-27) +117306*a(n-28) -4662*a(n-29) +351*a(n-30) -2889*a(n-31) -18387*a(n-32) +729*a(n-33) +243*a(n-35) +729*a(n-36) for n>37

Example

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

Crossrefs

Cf. A260015

Sequence in context: A104281 A217551 A179169 * A234085 A226536 A099052

Adjacent sequences: A260010 A260011 A260012 * A260014 A260015 A260016

Keyword

nonn

Author

R. H. Hardin, Jul 13 2015

Status

approved