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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A297221 Number of n X 5 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1s. 1
 6, 33, 182, 997, 5570, 30946, 171851, 955316, 5308160, 29497088, 163916530, 910869797, 5061672943, 28127490455, 156303166524, 868569845751, 4826603668246, 26821221189069, 149044329620412, 828232684722634 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) + 16*a(n-2) + 45*a(n-3) + 39*a(n-4) - 3*a(n-5) - 21*a(n-6) + 8*a(n-7) - 4*a(n-8) + a(n-9). Empirical g.f.: x*(6 + 27*x + 53*x^2 + 17*x^3 - 58*x^4 - 35*x^5 + 47*x^6 - 13*x^7 + x^8) / ((1 + 2*x + x^2 - x^3)*(1 - 3*x - 11*x^2 - 19*x^3 + 7*x^4 - 3*x^5 + x^6)). - Colin Barker, Feb 26 2019 EXAMPLE Some solutions for n=7: ..0..0..0..0..0. .0..0..0..1..1. .0..0..0..1..1. .0..0..0..0..0 ..0..0..0..1..1. .0..1..0..0..1. .1..1..0..0..0. .1..1..0..0..0 ..0..0..0..0..1. .1..0..0..1..0. .0..0..1..1..0. .0..0..0..1..1 ..0..0..0..1..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0 ..0..0..0..0..0. .0..0..1..1..0. .0..1..0..1..0. .1..1..0..1..0 ..0..0..1..0..0. .0..0..0..0..0. .1..0..0..0..0. .0..0..1..0..0 ..0..1..0..1..1. .0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0 CROSSREFS Column 5 of A297224. Sequence in context: A050151 A009162 A012718 * A006630 A180035 A360717 Adjacent sequences: A297218 A297219 A297220 * A297222 A297223 A297224 KEYWORD nonn AUTHOR R. H. Hardin, Dec 27 2017 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.

Last modified May 31 11:21 EDT 2023. Contains 363066 sequences. (Running on oeis4.)