Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having k horizontal segments (n>=2, k>=1). A horizontal segment is a maximal sequence of adjacent horizontal steps (1,0).
A274486
Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having k horizontal segments (n>=2, k>=1). A horizontal segment is a maximal sequence of adjacent horizontal steps (1,0).
Terms
- a(0) =1a(1) =2a(2) =3a(3) =2a(4) =4a(5) =8a(6) =1a(7) =5a(8) =20a(9) =10a(10) =6a(11) =40a(12) =45a(13) =6a(14) =7a(15) =70a(16) =140a(17) =56a(18) =2a(19) =8a(20) =112a(21) =350a(22) =280a(23) =44a(24) =9a(25) =168a(26) =756a(27) =1008a(28) =366a(29) =20
External references
- oeis: A274486