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A259889
Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000011
1
215, 653, 3511, 13373, 40435, 151483, 595513, 2101769, 7434765, 27615849, 101238339, 364229615, 1323891453, 4841497755, 17598175493, 63882224753, 232605289739, 846849589145, 3078975889701, 11198709862663, 40752724559215
OFFSET
1,1
COMMENTS
Column 3 of A259894
LINKS
FORMULA
Empirical: a(n) = a(n-1) +2*a(n-2) +18*a(n-3) +41*a(n-4) -a(n-5) -34*a(n-6) -98*a(n-7) -194*a(n-8) -5*a(n-9) +94*a(n-10) +37*a(n-11) +97*a(n-12) +21*a(n-13) -12*a(n-14) +2*a(n-15) -4*a(n-16)
EXAMPLE
Some solutions for n=4
..0..0..0..0..0....0..1..1..0..0....1..0..0..0..0....1..0..0..0..0
..1..0..0..0..1....0..0..0..0..0....1..0..0..0..0....1..0..0..0..0
..1..0..0..0..0....0..0..0..0..0....0..0..0..1..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..1
..0..0..0..0..0....1..0..0..0..0....0..0..0..0..0....0..0..0..0..1
..0..0..1..0..0....1..0..0..1..1....0..0..1..0..0....1..0..0..0..0
CROSSREFS
Sequence in context: A063358 A193398 A193396 * A362201 A137205 A091289
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 07 2015
STATUS
approved