Number of nX4 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 4 1s.
A295116
Number of nX4 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 4 1s.
Terms
- a(0) =4a(1) =20a(2) =77a(3) =326a(4) =1373a(5) =5793a(6) =24347a(7) =102398a(8) =431050a(9) =1813753a(10) =7631302a(11) =32111207a(12) =135119039a(13) =568549155a(14) =2392325744a(15) =10066404116a(16) =42357266765a(17) =178230161368a(18) =749953993371
External references
- oeis: A295116