209322

Appears in sequences

• a(1) = 1, a(n) = Sum_{k=1..n-1} ((7^k - 1)/6)*a(k).at n=4A015508
• Row sums of triangle A173302.at n=44A173303
• Difference between the number of primes with n digits (A006879) and the nearest integer to F[4n](S(n)), where F[4n](x) are Fibonacci polynomials and S(n) = Sum_{i=0..3} (C(i)*(log(log(A*(B+n^2))))^i) (see A228063).at n=8A228064
• a(n-5) is the number of nonempty subsets of {1,2,...,n} such that the difference of successive elements is at least 5.at n=37A330910