Number of nX1 0..3 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
A206790
Number of nX1 0..3 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal.
Terms
- a(0) =4a(1) =16a(2) =61a(3) =232a(4) =883a(5) =3361a(6) =12793a(7) =48694a(8) =185344a(9) =705475a(10) =2685250a(11) =10220869a(12) =38903701a(13) =148079185a(14) =563633908a(15) =2145360148a(16) =8165885869a(17) =31081817236a(18) =118306743223a(19) =450311041525
External references
- oeis: A206790