login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

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 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A207720 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 0 vertically 1
14, 196, 1414, 11970, 97580, 805154, 6614706, 54438356, 447687702, 3682876386, 30292582572, 249180165066, 2049642453502, 16859642486512, 138680722738530, 1140735510979302, 9383250687334776, 77183044399764898, 634878161131002558 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A207717

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 4*a(n-1) +37*a(n-2) -3*a(n-3) -132*a(n-4) +26*a(n-5) +132*a(n-6) -59*a(n-7) -15*a(n-8) +6*a(n-9) +a(n-10)

EXAMPLE

Some solutions for n=4

..1..0..1..1....1..0..1..0....1..0..1..0....0..1..0..0....0..1..0..0

..0..1..1..1....1..1..0..0....1..1..0..1....1..1..1..1....1..1..0..1

..1..0..1..1....1..0..1..0....0..1..1..1....0..1..1..1....1..1..0..0

..1..1..0..1....1..1..0..0....1..1..1..1....1..0..1..1....1..1..0..1

..0..1..1..1....1..1..1..0....1..0..1..0....1..1..1..0....1..1..0..0

CROSSREFS

Sequence in context: A208371 A208146 A207743 * A171288 A001023 A278476

Adjacent sequences:  A207717 A207718 A207719 * A207721 A207722 A207723

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 19 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 8 14:18 EST 2021. Contains 349596 sequences. (Running on oeis4.)