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A260979
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Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101
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1
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6526, 3683, 4688, 9728, 14672, 30418, 45504, 95248, 145748, 298612, 459656, 962406, 1514880, 3159306, 4901140, 10112892, 15968776, 33287288, 52776144, 108309796, 172770868, 355488952, 570503876, 1164669296, 1880888992, 3837475736
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 20*a(n-4) +4*a(n-5) +4*a(n-7) -147*a(n-8) -72*a(n-9) -3*a(n-10) -66*a(n-11) +690*a(n-12) +504*a(n-13) +48*a(n-14) +380*a(n-15) -2656*a(n-16) -2152*a(n-17) -312*a(n-18) -1496*a(n-19) +6833*a(n-20) +5472*a(n-21) +1244*a(n-22) +4112*a(n-23) -9128*a(n-24) -4128*a(n-25) -1536*a(n-26) -7184*a(n-27) -3428*a(n-28) -10480*a(n-29) -5280*a(n-30) -4552*a(n-31) +41776*a(n-32) +27808*a(n-33) +18384*a(n-34) +26272*a(n-35) -37136*a(n-36) -33600*a(n-37) -9680*a(n-38) -16160*a(n-39) -42752*a(n-40) +22144*a(n-41) -25792*a(n-42) -3264*a(n-43) +71360*a(n-44) +55936*a(n-45) +18432*a(n-46) +13312*a(n-47) +36544*a(n-48) -86272*a(n-49) +16384*a(n-50) -13312*a(n-52) -53248*a(n-53) for n>63
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EXAMPLE
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Some solutions for n=4
..0..1..0..0..0..0..1..0..0....0..0..1..0..1..0..0..0..0
..1..0..0..1..0..0..0..0..0....0..1..0..0..0..1..0..0..0
..0..0..1..0..0..1..0..0..0....0..0..0..1..0..0..0..0..1
..1..0..0..0..1..0..0..0..1....0..0..1..0..0..0..1..0..0
..0..1..0..0..0..0..1..0..0....1..0..0..0..1..0..0..1..0
..0..0..0..0..0..0..0..1..0....0..0..0..0..0..1..0..0..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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