128129

Appears in sequences

• Number of binary [ n,3 ] codes.at n=32A034357
• Numbers whose periodic derivative is equal to the arithmetic derivative.at n=14A274063
• Number of set partitions of [n] such that five is a multiple of each block size.at n=14A275423
• a(n) = the smallest positive integer that produces a product that contains the digit 2 when multiplied by 2 at most n times, and where a further multiplication by 2 produces a number that does not contain the digit 2. Set a(n) = -1 if no such number exists.at n=25A381183
• a(n) = Sum_{k=0..floor(n/3)} 2^(n-3*k) * binomial(2*k+1,2*n-6*k).at n=27A387650