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A259890
Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000011
1
499, 1853, 13373, 58800, 202632, 954624, 4585294, 18966448, 80737802, 366501170, 1610438050, 6928342996, 30446045528, 134338881490, 586149763228, 2560529857154, 11241312446298, 49255090317994, 215425770352536
OFFSET
1,1
COMMENTS
Column 4 of A259894
LINKS
FORMULA
Empirical: a(n) = a(n-1) +5*a(n-2) +34*a(n-3) +80*a(n-4) -71*a(n-5) -356*a(n-6) -455*a(n-7) -587*a(n-8) +739*a(n-9) +2387*a(n-10) +1309*a(n-11) +297*a(n-12) -613*a(n-13) -1780*a(n-14) -1644*a(n-15) -1034*a(n-16) -291*a(n-17) +137*a(n-18) +53*a(n-19) +18*a(n-20) +12*a(n-21) -6*a(n-22)
EXAMPLE
Some solutions for n=4
..0..0..0..0..1..0....1..0..0..0..0..0....0..0..0..1..1..0....0..0..1..0..0..1
..1..0..0..0..0..0....1..0..0..0..0..1....1..0..0..0..0..0....0..0..1..0..0..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..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..0
..1..0..0..0..0..0....0..1..1..0..0..1....1..0..0..0..0..1....0..0..0..0..0..0
CROSSREFS
Sequence in context: A045299 A106761 A243957 * A178044 A230004 A203735
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 07 2015
STATUS
approved