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

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A221570 Number of 0..5 arrays of length n with each element differing from at least one neighbor by something other than 1 1
 0, 26, 114, 676, 3734, 20944, 117104, 655198, 3665306, 20505052, 114711980, 641737294, 3590092664, 20084178100, 112357602542, 628565969692, 3516408049766, 19671961528672, 110051525562128, 615665004273436 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 5 of A221573 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 5*a(n-1) +3*a(n-2) +9*a(n-4) +6*a(n-5) +3*a(n-6). Empirical g.f.: -2*x^2*(13-8*x+14*x^2+6*x^3+6*x^4) / ( -1+5*x+3*x^2+9*x^4+6*x^5+3*x^6 ). - R. J. Mathar, Jun 06 2013 EXAMPLE Some solutions for n=6 ..4....0....4....1....2....5....4....4....2....0....0....1....1....3....0....3 ..0....5....2....3....4....2....0....4....5....3....5....4....3....5....3....5 ..0....2....4....5....0....5....0....0....4....5....0....1....0....2....0....1 ..1....5....5....3....1....4....2....3....1....4....3....2....1....4....3....3 ..3....1....0....1....4....1....1....1....0....2....2....2....5....2....0....3 ..1....5....5....5....0....3....4....5....4....0....2....4....3....5....0....1 CROSSREFS Sequence in context: A262476 A156385 A251262 * A100161 A100162 A051729 Adjacent sequences:  A221567 A221568 A221569 * A221571 A221572 A221573 KEYWORD nonn AUTHOR R. H. Hardin Jan 20 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 4 04:22 EST 2020. Contains 338921 sequences. (Running on oeis4.)