64869

Appears in sequences

• a(n) = n*(n-1)*(n^3 + 21*n^2 - 4*n + 96)/120.at n=21A124161
• Odd composite numbers such that the sum of any two terms, plus 1, is a prime.at n=9A133762
• Number of length-(n+1) 0..3 arrays with new repeated values introduced in sequential order starting with zero.at n=7A268256
• Number of ways to write n as an ordered sum of 9 primes.at n=21A340965
• a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(4*k,k).at n=6A383119