login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A207253
Number of nX7 0..1 arrays avoiding 0 0 1 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically
1
14, 196, 966, 5950, 34608, 207298, 1231650, 7328836, 43552190, 258926454, 1539300960, 9151641190, 54407912390, 323463778900, 1923038207286, 11432757777574, 67969500563024, 404089167742226, 2402372140150290
OFFSET
1,1
COMMENTS
Column 7 of A207254
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +7*a(n-2) +4*a(n-3) +102*a(n-4) +156*a(n-5) +223*a(n-6) +518*a(n-7) +545*a(n-8) +578*a(n-9) +532*a(n-10) +306*a(n-11) +173*a(n-12) -124*a(n-13) -147*a(n-14) -50*a(n-15) -14*a(n-16) +22*a(n-17) +a(n-18) +2*a(n-19) -a(n-20)
EXAMPLE
Some solutions for n=4
..1..0..0..0..0..0..0....1..1..1..0..0..0..0....1..1..0..0..0..0..0
..0..1..0..0..0..0..0....0..0..0..0..0..0..0....0..1..1..0..0..0..0
..0..1..0..0..0..0..0....0..0..0..0..0..0..0....0..1..1..0..0..0..0
..1..1..1..1..0..0..0....0..0..0..0..0..0..0....1..0..0..0..0..0..0
CROSSREFS
Sequence in context: A207074 A207407 A207708 * A208291 A207439 A207445
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 16 2012
STATUS
approved