a(n) = a(n-1) + 2^(k(n)), where k(n) is the n-th term of the sequence formed by k(1)=0 together with the numbers A042963.
A113870
a(n) = a(n-1) + 2^(k(n)), where k(n) is the n-th term of the sequence formed by k(1)=0 together with the numbers A042963.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =39a(4) =103a(5) =615a(6) =1639a(7) =9831a(8) =26215a(9) =157287a(10) =419431a(11) =2516583a(12) =6710887a(13) =40265319a(14) =107374183a(15) =644245095a(16) =1717986919a(17) =10307921511a(18) =27487790695a(19) =164926744167a(20) =439804651111
External references
- oeis: A113870