Number of horizontal segments of length 1 in all bargraphs of semiperimeter n (n>=2). By a horizontal segment of length 1 we mean a horizontal step that is not adjacent to any other horizontal step.
A274492
Number of horizontal segments of length 1 in all bargraphs of semiperimeter n (n>=2). By a horizontal segment of length 1 we mean a horizontal step that is not adjacent to any other horizontal step.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =16a(4) =52a(5) =170a(6) =556a(7) =1821a(8) =5973a(9) =19620a(10) =64536a(11) =212553a(12) =700903a(13) =2313864a(14) =7646670a(15) =25294673a(16) =83748689a(17) =277518319a(18) =920332567a(19) =3054319120a(20) =10143305864a(21) =33707066667a(22) =112078220233a(23) =372875904038
External references
- oeis: A274492