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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A213804 Number of 6 X 6 0..n symmetric arrays with all rows summing to 3*n. 0
 1, 1760, 526443, 34725760, 932587453, 13937940952, 138198204339, 1012226679296, 5875958390949, 28376054552968, 118033137259563, 433946033473016, 1438074947544977, 4362051703339832, 12258717265789491, 32233542519648928, 79941392042719253, 188248433874383736, 423266982431567911 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..18. EXAMPLE Some solutions for n=4 ..2..4..0..4..0..2....2..4..3..3..0..0....2..1..3..0..2..4....2..0..2..3..1..4 ..4..1..2..4..0..1....4..3..3..1..0..1....1..2..4..3..0..2....0..4..3..3..1..1 ..0..2..3..0..4..3....3..3..3..2..0..1....3..4..1..2..0..2....2..3..3..0..3..1 ..4..4..0..2..0..2....3..1..2..0..4..2....0..3..2..3..3..1....3..3..0..0..3..3 ..0..0..4..0..4..4....0..0..0..4..4..4....2..0..0..3..4..3....1..1..3..3..2..2 ..2..1..3..2..4..0....0..1..1..2..4..4....4..2..2..1..3..0....4..1..1..3..2..1 CROSSREFS Row 6 of A213800. Sequence in context: A020419 A141287 A238050 * A252309 A141039 A205731 Adjacent sequences: A213801 A213802 A213803 * A213805 A213806 A213807 KEYWORD nonn AUTHOR R. H. Hardin, Jun 20 2012 EXTENSIONS a(0)=1 prepended and terms a(12) and beyond from Andrew Howroyd, Apr 07 2020 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 April 23 12:59 EDT 2024. Contains 371913 sequences. (Running on oeis4.)