This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A184226 Half the number of (n+1)X5 0..3 arrays with every 2X2 subblock diagonal sum differing from its antidiagonal sum by more than 3 1
 621, 14641, 224156, 4207437, 72246797, 1292899174, 22718557269, 402560143085, 7106563915316, 125668351802785, 2220554387222673, 39250640995900250, 693688800303272397, 12260638522902016569, 216694437717450254826 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A184231 LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n)=17*a(n-1)+108*a(n-2)-1760*a(n-3)-1953*a(n-4)+58066*a(n-5)-35781*a(n-6)-761159*a(n-7)+923230*a(n-8)+4884844*a(n-9)-7337776*a(n-10)-16577262*a(n-11)+28574166*a(n-12)+29948774*a(n-13)-60427857*a(n-14)-27012303*a(n-15)+71527868*a(n-16)+9323166*a(n-17)-48297090*a(n-18)+2120251*a(n-19)+18623886*a(n-20)-2698012*a(n-21)-3945852*a(n-22)+813213*a(n-23)+409293*a(n-24)-99576*a(n-25)-14904*a(n-26)+3888*a(n-27) EXAMPLE Some solutions for 3X5 ..0..2..1..3..1....0..3..0..3..2....2..0..2..0..3....2..1..3..1..3 ..2..0..3..0..3....3..0..2..0..3....1..3..1..3..0....0..3..0..3..1 ..1..3..1..3..0....2..3..1..3..2....2..0..3..1..2....3..0..3..0..3 CROSSREFS Sequence in context: A189119 A203086 A251243 * A260764 A224432 A229318 Adjacent sequences:  A184223 A184224 A184225 * A184227 A184228 A184229 KEYWORD nonn AUTHOR R. H. Hardin Jan 10 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 14 19:27 EST 2019. Contains 329987 sequences. (Running on oeis4.)