Sum of the abscissae of the first descents of all bargraphs of semiperimeter n (n>=2).

A273898

Sum of the abscissae of the first descents of all bargraphs of semiperimeter n (n>=2).

Terms

    a(0) =1a(1) =3a(2) =9a(3) =27a(4) =81a(5) =244a(6) =739a(7) =2251a(8) =6895a(9) =21232a(10) =65703a(11) =204245a(12) =637573a(13) =1997892a(14) =6282635a(15) =19820580a(16) =62716923a(17) =198997349a(18) =633015543a(19) =2018391204a(20) =6449819095a(21) =20652628601a(22) =66256638509a(23) =212939343591a(24) =685497649231

External references