39411

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = 1 and a(3) = 4.at n=16A049898
• Structured heptagonal diamond numbers (vertex structure 5).at n=28A100179
• Number of binary arrays indicating the locations of trailing edge maxima of a random length-n 0..7 array extended with zeros and convolved with 1,2,1.at n=21A222126
• a(n) = Sum_{k=0..floor(n/2)} binomial(n,k) * binomial(n+3*k,n-2*k).at n=8A389153