Number of nX1 0..n+1-2 arrays with upper left zero and lower right n+1-2 and each element differing from its horizontal and vertical neighbors by one or two.
A265440
Number of nX1 0..n+1-2 arrays with upper left zero and lower right n+1-2 and each element differing from its horizontal and vertical neighbors by one or two.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =9a(5) =29a(6) =79a(7) =220a(8) =673a(9) =2106a(10) =6480a(11) =19803a(12) =61085a(13) =190155a(14) =593635a(15) =1854310a(16) =5802490a(17) =18203576a(18) =57227627a(19) =180170568a(20) =567940927a(21) =1792532647a(22) =5664324570a(23) =17917857888a(24) =56732156348a(25) =179781808709a(26) =570178314799
External references
- oeis: A265440