4459455

Appears in sequences

• Denominator of Sum_{k=0..n} 1/binomial(n,k)^2.at n=15A100517
• Triangle read by rows: T(n,k) is the number of linear chord diagrams on 2n vertices with one marked chord such that exactly k of the remaining n-1 chords are contained within the marked chord.at n=43A336599
• Numbers k such that A001414(k) and A001414(A004086(k)) are twin primes p, p+2.at n=28A337047