54573

Appears in sequences

• Repeated terms in A087657 (a(n) = |prime(n)-a(n-1)| + |prime(n)-a(n-2)| + |prime(n)-a(n-3)| ).at n=12A087658
• Expansion of c(2*x^2)/(1-x*c(2*x^2)), where c(x) = (1-sqrt(1-4*x))/(2*x) is the g.f. of the Catalan numbers (A000108).at n=13A126087
• Square array A(n,k) by antidiagonals. A(n,k) is the number of length 2n k-ary words (n,k>=0), either empty or beginning with the first character of the alphabet, that can be built by repeatedly inserting doublets into the initially empty word.at n=62A183134
• Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting seven doublets into the initially empty word.at n=3A194719
• Number of ternary words either empty or beginning with the first character of the alphabet, that can be built by inserting n doublets into the initially empty word.at n=7A194723
• Expansion of (-1 + Product_{k>=1} 1 / (1 + (-x)^k))^3.at n=44A341241