The length of the longest initial sequence of the form UHUH..., summed over all bargraphs having semiperimeter n (n>=2).

A274495

The length of the longest initial sequence of the form UHUH..., summed over all bargraphs having semiperimeter n (n>=2).

Terms

    a(0) =2a(1) =3a(2) =9a(3) =23a(4) =62a(5) =171a(6) =482a(7) =1384a(8) =4036a(9) =11924a(10) =35619a(11) =107407a(12) =326521a(13) =999675a(14) =3079634a(15) =9539366a(16) =29693294a(17) =92831327a(18) =291366477a(19) =917765199a(20) =2900217452a(21) =9192097510a(22) =29213057684a(23) =93073003438a(24) =297215560553a(25) =951144390092

External references