Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,3,1,1,0 for x=0,1,2,3,4.
A197497
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,3,1,1,0 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =1a(2) =9a(3) =9a(4) =19a(5) =45a(6) =73a(7) =147a(8) =291a(9) =539a(10) =1051a(11) =2025a(12) =3863a(13) =7451a(14) =14313a(15) =27465a(16) =52817a(17) =101457a(18) =194891a(19) =374517a(20) =719505a(21) =1382347a(22) =2655995a(23) =5102835a(24) =9804019a(25) =18836497a(26) =36190191a(27) =69531891a(28) =133591057a(29) =256666833
External references
- oeis: A197497