Total area of all 1-histograms of length n.

Terms

a(0) =1a(1) =7a(2) =44a(3) =268a(4) =1609a(5) =9583a(6) =56792a(7) =335448a(8) =1976689a(9) =11627735a(10) =68308580a(11) =400870468a(12) =2350563097a(13) =13773547487a(14) =80663415344a(15) =472175746096