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

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!)
 A255629 Number of length n+7 0..2 arrays with at most two downsteps in every n consecutive neighbor pairs 1
 6561, 19683, 59049, 152106, 322078, 602886, 1047141, 1706242, 2653107, 3977859, 5790140, 8221629, 11428785, 15595837, 20938044, 27705249, 36185752, 46710528, 59657817, 75458114, 94599588, 117633960, 145182871, 177944772, 216702369 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 7 of A255622 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = (1/40320)*n^8 + (23/10080)*n^7 + (239/2880)*n^6 + (1541/144)*n^5 + (920887/5760)*n^4 + (442121/1440)*n^3 + (42883817/3360)*n^2 - (2307073/56)*n + 29319 for n>5 EXAMPLE Some solutions for n=4 ..1....2....0....2....1....1....2....2....2....1....0....2....0....0....0....1 ..1....0....1....0....0....0....0....0....0....0....0....0....2....1....0....1 ..1....0....2....0....1....0....0....1....0....1....1....0....0....0....0....1 ..2....0....1....2....2....2....1....1....0....2....2....1....2....2....1....1 ..0....1....1....2....1....2....2....1....0....1....1....2....0....1....1....1 ..2....2....2....0....2....0....0....1....0....0....0....0....2....2....0....1 ..1....1....0....0....0....2....0....2....2....2....2....0....0....2....2....2 ..2....1....2....1....0....0....2....0....0....2....2....0....0....2....2....0 ..2....0....1....1....0....1....0....1....2....2....0....0....1....2....2....2 ..2....2....2....2....0....1....0....1....2....2....1....0....2....0....2....2 ..1....0....1....0....0....0....1....1....0....0....0....1....2....2....1....2 CROSSREFS Cf. A255622 Sequence in context: A046321 A043456 A255114 * A017080 A017164 A017380 Adjacent sequences:  A255626 A255627 A255628 * A255630 A255631 A255632 KEYWORD nonn AUTHOR R. H. Hardin, Feb 28 2015 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 5 17:28 EST 2021. Contains 349557 sequences. (Running on oeis4.)