The OEIS is supported by the many generous donors to the OEIS 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 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A224720 Number of (n+3)X(n+3) 0..2 matrices with each 4X4 subblock idempotent 0
 2052, 1920, 3092, 3924, 4498, 7090, 11268, 16568, 22726, 32326, 47310, 69124, 98934, 141122, 202398, 291280, 417790, 597382, 853688, 1220732, 1744804, 2491066, 3553342, 5066576, 7221562, 10287590, 14646626, 20842212, 29645776 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A224728 LINKS Table of n, a(n) for n=1..29. EXAMPLE Some solutions for n=2 ..1..0..0..0..1....1..1..2..2..2....1..1..0..0..0....0..0..0..0..0 ..1..0..0..0..1....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 ..0..0..0..0..2....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0 ..2..0..0..0..1....0..0..0..0..0....0..0..0..0..1....0..0..0..0..0 ..1..0..0..0..1....1..2..1..1..1....0..0..0..0..1....0..0..1..1..1 CROSSREFS Sequence in context: A168176 A224728 A224721 * A320277 A322102 A206068 Adjacent sequences: A224717 A224718 A224719 * A224721 A224722 A224723 KEYWORD nonn AUTHOR R. H. Hardin Apr 16 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 5 03:25 EST 2023. Contains 367567 sequences. (Running on oeis4.)