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

Terms

a(0) =1a(1) =3a(2) =10a(3) =32a(4) =101a(5) =318a(6) =1003a(7) =3173a(8) =10071a(9) =32071a(10) =102453a(11) =328260a(12) =1054620a(13) =3396757a(14) =10965653a(15) =35475159a(16) =114989969a(17) =373400210a(18) =1214529314a(19) =3956450250a(20) =12906762704a(21) =42159475998a(22) =137877383739a(23) =451403471067