1017984

Appears in sequences

• a(n) = 2*(a(n-1) + a(n-2)), a(0) = 0, a(1) = 1.at n=15A002605
• a(n)*a(n+3) - a(n+1)*a(n+2) = 2^n, given a(0)=1, a(1)=1, a(2)=6.at n=14A080879
• a(n) = Sum_{k=0..n} binomial(2n+1, 2k)*3^(n-k).at n=7A102591
• Expansion of g.f.: x^2*(1 + x - x^2)/(1 - 2*x^2 - 2*x^4).at n=30A160444
• Elements of A160444, pairs of consecutive entries swapped.at n=31A160572
• Number of nX1 0..2 arrays with no more than floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.at n=14A222848
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with values 0..2 introduced in row major order.at n=27A232137
• Number of (7+1)X(n+1) 0..2 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with values 0..2 introduced in row major order.at n=0A232144