4813380

Appears in sequences

• Triangle, read by rows, defined by T(n,k) = A000108(n-k)*A001147(k)*C(n,2*k), for k=0..[n/2], n>=0, where A000108 is the Catalan numbers and A001147 is the double factorials.at n=38A125080
• Alphabetic length of a divide-and-conquer approach to the regular expression for permutations of n symbols.at n=12A320460