login
A260366
Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111
1
436, 700, 2014, 4633, 5326, 12858, 32488, 46993, 89140, 223963, 379838, 657619, 1551102, 2943373, 5005180, 10882474, 22057020, 38567570, 77971796, 162031604, 295335654, 570612861, 1181007446, 2235793266, 4234428804, 8612184438
OFFSET
1,1
COMMENTS
Column 4 of A260370
LINKS
FORMULA
Empirical: a(n) = 2*a(n-2) +8*a(n-3) +12*a(n-4) -13*a(n-5) -41*a(n-6) -74*a(n-7) -48*a(n-8) +117*a(n-9) +285*a(n-10) +320*a(n-11) +86*a(n-12) -554*a(n-13) -1101*a(n-14) -814*a(n-15) +181*a(n-16) +1674*a(n-17) +2737*a(n-18) +1245*a(n-19) -1501*a(n-20) -3641*a(n-21) -4387*a(n-22) -604*a(n-23) +3881*a(n-24) +4764*a(n-25) +4047*a(n-26) -556*a(n-27) -4431*a(n-28) -3433*a(n-29) -2418*a(n-30) +457*a(n-31) +2649*a(n-32) +1428*a(n-33) +977*a(n-34) -28*a(n-35) -834*a(n-36) -270*a(n-37) -233*a(n-38) -54*a(n-39) +136*a(n-40) +20*a(n-41) +21*a(n-42) +7*a(n-43) -8*a(n-44) for n>46
EXAMPLE
Some solutions for n=4
..1..1..0..0..1..1....0..0..0..0..0..1....0..0..0..0..1..0....1..0..0..0..0..0
..0..1..0..0..1..0....1..1..0..0..1..1....0..1..0..0..1..0....1..1..0..0..1..1
..0..0..0..0..0..0....0..0..0..0..1..1....0..1..0..0..0..0....0..0..0..0..0..1
..0..0..0..0..0..0....0..0..0..0..0..1....0..0..0..0..0..0....0..0..0..0..0..1
..1..1..0..0..1..0....0..1..0..0..0..1....0..0..0..0..1..1....0..1..0..0..1..1
..1..0..0..0..1..0....1..0..0..0..1..1....1..1..0..0..0..1....1..0..0..0..0..0
CROSSREFS
Sequence in context: A124043 A345554 A345808 * A250781 A260012 A234221
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 23 2015
STATUS
approved