Number of bargraphs of semiperimeter n having no horizontal segments of length 1 (n>=2). By a horizontal segment of length 1 we mean a horizontal step that is not adjacent to any other horizontal step.
A274493
Number of bargraphs of semiperimeter n having no horizontal segments of length 1 (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) =0a(1) =1a(2) =2a(3) =3a(4) =6a(5) =13a(6) =27a(7) =57a(8) =123a(9) =267a(10) =584a(11) =1289a(12) =2864a(13) =6399a(14) =14373a(15) =32435a(16) =73498a(17) =167175a(18) =381551a(19) =873541a(20) =2005622a(21) =4616895a(22) =10653607a(23) =24638263a(24) =57097885a(25) =132575577a(26) =308378460a(27) =718506295a(28) =1676706422a(29) =3918515001
External references
- oeis: A274493