a(n) = the total lengths of all the top arches of semi-meanders with n top arches where arch length = 1 + number of arches covered by the arch.
A385239
a(n) = the total lengths of all the top arches of semi-meanders with n top arches where arch length = 1 + number of arches covered by the arch.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =24a(4) =86a(5) =268a(6) =944a(7) =3026a(8) =10572a(9) =34488a(10) =120072a(11) =396402a(12) =1377834a(13) =4587984a(14) =15935096a(15) =53405794a(16) =185433728a(17) =624610832a(18) =2168617008a(19) =7334202690a(20) =25465812558a(21) =86408653972a(22) =300072064992
External references
- oeis: A385239