835278

Appears in sequences

• Number of (s(0), s(1), ..., s(n)) such that every s(i) is a nonnegative integer, s(0) = 0, s(1) = 1 = s(n), |s(i) - s(i-1)| <= 1 for i >= 2, |s(2) - s(1)| = 1, |s(3) - s(2)| = 1 if s(2) = 1. Also T(n,n-1), where T is the array in A026268.at n=14A026270
• Numbers n such that the sum of the hexagonal numbers X(n) and X(n+1) is equal to the heptagonal number H(m) for some m.at n=3A252985
• a(0) = 1 and a(n) = A224704(n) - A224704(n-1).at n=25A316356