236776

Appears in sequences

• a(n) = Sum_{k=0..n} f(k)*f(n-k) where f(k) = A002124(k).at n=45A002125
• 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=18A049946
• Number of binary strings of length n with equal numbers of 0011 and 1100 substrings.at n=19A164175