Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.
A207415
Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically.
Terms
- a(0) =9a(1) =81a(2) =241a(3) =742a(4) =2760a(5) =8465a(6) =24317a(7) =73405a(8) =214117a(9) =601411a(10) =1698702a(11) =4766632a(12) =13156641a(13) =36175599a(14) =99198867a(15) =270109351a(16) =732494449a(17) =1982055330a(18) =5345239912a(19) =14374634237a(20) =38587852393a(21) =103391960861a(22) =276535572481a(23) =738655032563
External references
- oeis: A207415