153458

Appears in sequences

• Number of n X 2 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.at n=13A209368
• a(n) = (A262024(n)-1)/2: a(n)*(a(n) + 1) = d(n)*Y(n)^2 with d(n) = A007969 and Y(n) = A261250(n).at n=73A262025