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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A183977 1/4 the number of (n+1)X(n+1) binary arrays with all 2X2 subblock sums the same 0
 4, 8, 14, 26, 46, 86, 158, 302, 574, 1118, 2174, 4286, 8446, 16766, 33278, 66302, 132094, 263678 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A183986 LINKS Table of n, a(n) for n=1..18. EXAMPLE Some solutions for 5X5 ..1..0..1..0..1....0..1..0..1..0....1..1..1..1..1....0..1..1..0..1 ..1..0..1..0..1....1..0..1..0..1....0..1..0..1..0....1..0..0..1..0 ..0..1..0..1..0....1..0..1..0..1....1..1..1..1..1....0..1..1..0..1 ..1..0..1..0..1....1..0..1..0..1....1..0..1..0..1....1..0..0..1..0 ..0..1..0..1..0....1..0..1..0..1....1..1..1..1..1....0..1..1..0..1 CROSSREFS Sequence in context: A008029 A129080 A138643 * A153364 A124743 A188575 Adjacent sequences: A183974 A183975 A183976 * A183978 A183979 A183980 KEYWORD nonn AUTHOR R. H. Hardin Jan 08 2011 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 June 9 13:19 EDT 2023. Contains 363180 sequences. (Running on oeis4.)