690204

Appears in sequences

• Number of nX6 0..3 arrays with row sums equal and column sums unequal to adjacent columns.at n=1A203030
• T(n,k)=Number of nXk 0..3 arrays with row sums equal and column sums unequal to adjacent columns.at n=22A203031
• Number of 2Xn 0..3 arrays with row sums equal and column sums unequal to adjacent columns.at n=5A203032
• Expansion of Product_{k>=1} ((1 - x^k)/(1 + x^k))^(sigma(k)).at n=36A320971