1127280

Appears in sequences

• Numbers that can be expressed as the difference of the squares of primes in exactly eighteen distinct ways.at n=2A092014
• Number of n X n symmetric 0..2 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 2 and with new values 0..2 introduced in lower triangular row major order.at n=5A192765
• G.f.: Sum_{n>=0} n^n * x^n * (1 + 2*n*x)^n / (1 + n*x + 2*n^2*x^2)^(n+1).at n=7A240958