login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A232151 Number of 3Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, diagonally or antidiagonally 1
1, 145, 3669, 67725, 1345057, 27888353, 572956549, 11720173753, 239945876241, 4914834120181, 100662128740253, 2061578515560877, 42221864226950145, 864724020040862701, 17709947243340576177, 362707660633719422837 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 3 of A232149
LINKS
FORMULA
Empirical: a(n) = 15*a(n-1) +68*a(n-2) +683*a(n-3) +4587*a(n-4) +1332*a(n-5) -32302*a(n-6) -47941*a(n-7) -49247*a(n-8) -33578*a(n-9) +48420*a(n-10) +25707*a(n-11) +23404*a(n-12) +22761*a(n-13) +1376*a(n-14) +2938*a(n-15) -66*a(n-16) -640*a(n-17) +368*a(n-18) -240*a(n-19)
EXAMPLE
Some solutions for n=4
..1..2..2..1....1..1..2..1....0..0..2..1....0..1..0..2....1..2..0..1
..2..2..2..0....0..2..1..2....1..1..2..1....1..2..2..2....1..1..2..2
..2..0..1..2....2..0..2..2....0..2..0..1....2..1..2..1....0..0..0..2
CROSSREFS
Sequence in context: A365204 A269015 A234116 * A264284 A008377 A076464
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 19 2013
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 1 22:23 EST 2024. Contains 370443 sequences. (Running on oeis4.)