174571

Properties

Appears in sequences

• a(n) = Sum_{k=0..floor(n/2)} T(n-k,k), T given by A026758.at n=23A026768
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element at a city block distance of two, and containing the value n(n+1)/2-2.at n=33A212031
• Prime numbersat n=15881