Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 1 vertically.
A207689
Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 1 1 vertically.
Terms
- a(0) =9a(1) =81a(2) =100a(3) =256a(4) =576a(5) =1156a(6) =2500a(7) =5476a(8) =11664a(9) =24964a(10) =53824a(11) =115600a(12) =248004a(13) =532900a(14) =1144900a(15) =2458624a(16) =5280804a(17) =11343424a(18) =24364096a(19) =52330756a(20) =112402404a(21) =241429444a(22) =518563984a(23) =1113823876a(24) =2392383744a(25) =5138595856a(26) =11037183364a(27) =23706760900
External references
- oeis: A207689