a(1) = 1, a(n) is the smallest number greater than the previous term that cannot be obtained as the sum of products of any group of earlier terms.

A075560

a(1) = 1, a(n) is the smallest number greater than the previous term that cannot be obtained as the sum of products of any group of earlier terms.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =10a(4) =22a(5) =50a(6) =106a(7) =230a(8) =480a(9) =1054a(10) =2656a(11) =6782a(12) =17254a(13) =64366a(14) =212752a(15) =1873528a(16) =9518730

External references