a(n) = s(k), where k is the n-th number such that s(j) < s(k) for all j < k, where s = A026142. Also a(n) = 2*t(n) for n >= 2, where t = A026144.

A026145

a(n) = s(k), where k is the n-th number such that s(j) < s(k) for all j < k, where s = A026142. Also a(n) = 2*t(n) for n >= 2, where t = A026144.