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!)
 A241428 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4 0
 2, 5, 22, 515, 7495, 377314, 79901137, 34796682706 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A241435 LINKS EXAMPLE Some solutions for n=4 ..2..2..3..3....3..3..2..2....2..2..3..2....2..2..3..2....2..2..3..2 ..2..1..3..2....3..1..2..0....2..1..1..0....2..1..1..2....2..1..1..2 ..2..1..2..3....2..2..2..0....3..3..2..2....3..3..2..2....3..3..0..0 ..2..0..2..2....2..0..0..0....2..1..2..3....2..2..0..2....2..1..3..0 CROSSREFS Sequence in context: A326959 A034384 A078419 * A070281 A198444 A019368 Adjacent sequences:  A241425 A241426 A241427 * A241429 A241430 A241431 KEYWORD nonn AUTHOR R. H. Hardin, Apr 22 2014 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 12 09:36 EST 2019. Contains 329953 sequences. (Running on oeis4.)