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!)
A242548 Number of length n+3 0..7 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..7 introduced in 0..7 order 1
13, 43, 166, 712, 3340, 17004, 93103, 543773, 3362689, 21854355, 148145552, 1039764960, 7504319914, 55361803579, 415379230159, 3156808241415, 24223346602916, 187213792659552, 1454634743756302, 11346966341306231 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A242549
LINKS
FORMULA
Empirical: a(n) = 22*a(n-1) -190*a(n-2) +924*a(n-3) -3465*a(n-4) +10962*a(n-5) -24402*a(n-6) +45828*a(n-7) -74016*a(n-8) +19016*a(n-9) -23090*a(n-10) -159064*a(n-11) +571211*a(n-12) +704098*a(n-13) +1846562*a(n-14) +2774132*a(n-15) +616507*a(n-16) -2599138*a(n-17) -8906720*a(n-18) -16117180*a(n-19) -18096476*a(n-20) -15823920*a(n-21) -10584000*a(n-22) -4233600*a(n-23) -705600*a(n-24)
EXAMPLE
Some solutions for n=4
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....1....1....1....1....1....0....0....1....1....1....1....1....1
..1....2....0....2....0....2....2....2....1....1....1....1....0....2....1....2
..0....2....2....1....0....0....3....3....2....2....2....1....0....3....2....3
..2....1....2....3....2....0....1....2....1....1....3....0....1....4....0....4
..1....2....1....4....1....2....0....1....3....0....3....2....2....1....0....4
..1....3....3....0....2....3....3....1....0....2....2....1....3....0....0....0
CROSSREFS
Sequence in context: A242545 A242546 A242547 * A104115 A063650 A220612
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 17 2014
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 February 28 20:40 EST 2024. Contains 370400 sequences. (Running on oeis4.)