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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A224118 T(n,k)=Number of idempotent n X n 0..k matrices of rank n-2 4
 0, 0, 1, 0, 1, 27, 0, 1, 69, 282, 0, 1, 123, 1434, 2050, 0, 1, 195, 4182, 20810, 12405, 0, 1, 273, 9762, 103050, 260235, 67557, 0, 1, 375, 19110, 368130, 2273505, 3037167, 344708, 0, 1, 477, 34602, 1042030, 12775065, 47922021, 34229076, 1686132, 0, 1, 603 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS Table starts .......0........0........0.........0........0.......0.....0...0.0.0 .......1........1........1.........1........1.......1.....1...1.1 ......27.......69......123.......195......273.....375...477.603 .....282.....1434.....4182......9762....19110...34602.56982 ....2050....20810...103050....368130..1042030.2563150 ...12405...260235..2273505..12775065.52968495 ...67557..3037167.47922021.427616679 ..344708.34229076 .1686132 LINKS R. H. Hardin, Table of n, a(n) for n = 1..52 EXAMPLE Some solutions for n=3 k=4 ..1..0..0....1..3..0....1..3..0....0..3..3....0..0..0....0..1..0....0..0..1 ..1..0..0....0..0..0....0..0..0....0..1..1....0..0..1....0..1..0....0..0..3 ..3..0..0....1..3..0....0..0..0....0..0..0....0..0..1....0..0..0....0..0..1 CROSSREFS Row 3 is A224525 Row 4 is A224115 Sequence in context: A005084 A050454 A277042 * A178737 A005067 A163574 Adjacent sequences:  A224115 A224116 A224117 * A224119 A224120 A224121 KEYWORD nonn,tabl AUTHOR R. H. Hardin Apr 09 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 May 17 17:06 EDT 2022. Contains 353747 sequences. (Running on oeis4.)