23818

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (composite numbers), t = (odd natural numbers).at n=41A025104
• Number of n X 5 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.at n=10A266009