A261110 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101

183, 402, 1408, 3908, 13040, 35934, 121313, 333722, 1122579, 3092874, 10415091, 28671638, 96526178, 265814264, 894920841, 2464173816, 8296223239, 22844373272, 76910486512, 211778585434, 713000156702, 1963298223048, 6609877528867

Offset

1,1

Comments

Column 5 of A261113

Links

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

Formula

Empirical: a(n) = 5*a(n-2) +35*a(n-4) +47*a(n-6) -39*a(n-8) -15*a(n-10) -71*a(n-12) +169*a(n-14) -113*a(n-16) +39*a(n-18) -10*a(n-20) +a(n-22) +a(n-24) for n>25

Example

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

Crossrefs

Cf. A261113

Sequence in context: A030465 A147270 A147124 * A260172 A252070 A193253

Adjacent sequences: A261107 A261108 A261109 * A261111 A261112 A261113

Keyword

nonn

Author

R. H. Hardin, Aug 08 2015

Status

approved