A259948 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000101

365, 1507, 8699, 35765, 141619, 642779, 2922457, 12595119, 54554391, 241207419, 1062079283, 4640861117, 20328211369, 89287996191, 391693962409, 1716670831027, 7528074602903, 33022954863143, 144821506333677

Offset

1,1

Comments

Column 4 of A259952

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +6*a(n-2) +11*a(n-3) +70*a(n-4) -95*a(n-5) -212*a(n-6) +99*a(n-7) -450*a(n-8) +207*a(n-9) +1325*a(n-10) -637*a(n-11) +440*a(n-12) +561*a(n-13) -1601*a(n-14) +264*a(n-15) +325*a(n-16) -48*a(n-17) +103*a(n-18) -226*a(n-19) +17*a(n-20) -46*a(n-21) +20*a(n-22) -8*a(n-23) +2*a(n-24) for n>27

Example

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

Crossrefs

Cf. A259952

Sequence in context: A043443 A275271 A062681 * A203806 A251314 A275182

Adjacent sequences: A259945 A259946 A259947 * A259949 A259950 A259951

Keyword

nonn

Author

R. H. Hardin, Jul 10 2015

Status

approved