20636

Appears in sequences

• a(n+1) = 1 + a( floor(n/1) ) + a( floor(n/2) ) + ... + a( floor(n/n) ).at n=47A003318
• a(n) = floor((Pi/2)^n).at n=22A014214
• Numbers of partitions of 2n into n primes.at n=44A102108
• Number of permutations of 1..n with all differences of elements separated by distances 1 through 7 being respectively unique.at n=19A170813
• a(n) = Sum_{k=0..n} 2^(n-k) * binomial(n+4,k+4) * binomial(2*k+8,k+8).at n=4A387274