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A202372
Number of (n+2)X4 binary arrays avoiding patterns 001 and 111 in rows and columns
1
257, 824, 2293, 5677, 13751, 31240, 68965, 148281, 310793, 640839, 1299608, 2601118, 5148674, 10088995, 19604270, 37808312, 72431966, 137955751, 261370700, 492867363, 925469673, 1731093570, 3226750237, 5995509954, 11107634611
OFFSET
1,1
COMMENTS
Column 2 of A202378
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +5*a(n-2) -12*a(n-3) -34*a(n-4) +30*a(n-5) +110*a(n-6) +16*a(n-7) -230*a(n-8) -171*a(n-9) +177*a(n-10) +360*a(n-11) +66*a(n-12) -172*a(n-13) -248*a(n-14) -135*a(n-15) -72*a(n-16) +182*a(n-17) +196*a(n-18) +148*a(n-19) -68*a(n-20) -39*a(n-21) -106*a(n-22) -13*a(n-23) -46*a(n-24) +29*a(n-25) -34*a(n-26) +16*a(n-27) -5*a(n-28) +42*a(n-29) +13*a(n-30) +22*a(n-31) -8*a(n-32) -6*a(n-33) -14*a(n-34) -3*a(n-35) -2*a(n-36) +2*a(n-37) +a(n-38) +a(n-39)
EXAMPLE
Some solutions for n=7
..1..1..0..1....1..1..0..1....1..0..1..1....1..1..0..1....1..1..0..0
..1..0..1..1....0..0..0..0....0..1..1..0....1..0..1..0....0..1..1..0
..0..1..0..0....1..1..0..1....1..0..0..0....0..1..1..0....1..0..0..0
..1..0..1..0....0..1..0..1....0..1..0..0....1..0..0..0....1..1..0..0
..0..1..0..0....1..0..0..0....0..0..0..0....1..0..0..0....0..1..0..0
..1..0..0..0....1..1..0..0....0..0..0..0....0..0..0..0....1..0..0..0
..1..1..0..0....0..1..0..0....0..0..0..0....1..0..0..0....0..1..0..0
..0..1..0..0....1..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....0..0..0..0
CROSSREFS
Sequence in context: A229856 A208178 A105131 * A363715 A036549 A352983
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 18 2011
STATUS
approved