The sum of the widths of all bargraphs of semiperimeter n (n>=2).

Terms

a(0) =1a(1) =3a(2) =10a(3) =33a(4) =108a(5) =353a(6) =1154a(7) =3776a(8) =12371a(9) =40586a(10) =133337a(11) =438641a(12) =1444848a(13) =4764919a(14) =15731660a(15) =51993074a(16) =172003177a(17) =569531599a(18) =1887392588a(19) =6259572697a(20) =20775058670a(21) =68997611310a(22) =229298384183a(23) =762475061094