309042

Appears in sequences

• 1/36 the number of (n+2)X7 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last.at n=6A184453
• 1/36 the number of (n+2) X 9 0..2 arrays with each 3 X 3 subblock containing two of one value, two of another, and five of the last.at n=4A184455
• G.f.: ((1+2*x)*sqrt(1-6*x^2+x^4)-1+5*x^2-2*x^3)/(2*x*(1-6*x^2)).at n=17A212205
• a(n) = A212205(2*n + 1).at n=8A225887