Sum of the lengths of the first descents in all bargraphs having semiperimeter n (n>=2). A descent is a maximal sequence of consecutive down steps.
A276068
Sum of the lengths of the first descents in all bargraphs having semiperimeter n (n>=2). A descent is a maximal sequence of consecutive down steps.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =26a(4) =74a(5) =210a(6) =598a(7) =1715a(8) =4963a(9) =14504a(10) =42808a(11) =127553a(12) =383451a(13) =1162134a(14) =3548060a(15) =10904023a(16) =33708595a(17) =104756233a(18) =327086895a(19) =1025603074a(20) =3228082910a(21) =10195295005a(22) =32300276271a(23) =102622734570a(24) =326893843104
External references
- oeis: A276068