182598

Appears in sequences

• a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4).at n=19A145028
• Number of n X 4 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.at n=13A280550