1520768

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=16A209368
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n) + n, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=25A296556