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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A228387 Number of nX5 binary arrays with top left value 1 and no two ones adjacent horizontally or vertically. 1
 5, 29, 268, 2104, 17578, 143072, 1177709, 9646285, 79185086, 649376899, 5327739196, 43702127758, 358509826061, 2940912358777, 24125201563249, 197904782854703, 1623466068552246, 13317706169767704, 109248620592925041 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A228390 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-1) +36*a(n-2) -105*a(n-4) +15*a(n-5) +64*a(n-6) -20*a(n-7) -4*a(n-8) +a(n-9) EXAMPLE Some solutions for n=4 ..1..0..0..0..0....1..0..0..1..0....1..0..0..0..0....1..0..0..0..1 ..0..0..1..0..1....0..0..1..0..1....0..1..0..1..0....0..1..0..1..0 ..1..0..0..0..0....1..0..0..0..0....0..0..1..0..0....1..0..0..0..0 ..0..0..0..0..1....0..0..0..0..1....0..0..0..0..0....0..0..0..0..1 CROSSREFS Sequence in context: A345098 A144015 A326986 * A181356 A177440 A292567 Adjacent sequences:  A228384 A228385 A228386 * A228388 A228389 A228390 KEYWORD nonn AUTHOR R. H. Hardin Aug 21 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 August 3 08:21 EDT 2021. Contains 346435 sequences. (Running on oeis4.)