2096129

Appears in sequences

• a(n) = (-1)^(n+1) * coefficient of x^n in Sum_{k>=1} x^k/(1+2*x^k).at n=21A081295
• a(n) = 2^(n-1)*(2^n - 1) + 1.at n=11A134169
• Hilltop maps: number of n X 3 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 n X 3 array.at n=6A218237
• Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 nX7 array.at n=2A218241
• T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 nXk array.at n=38A218242
• T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 nXk array.at n=42A218242
• Hilltop maps: number of nX7 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 nX7 array.at n=2A218637
• T(n,k)=Hilltop maps: number of nXk binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 nXk array.at n=38A218638
• a(n) = Sum_{d|n} (-1)^(d-1) * 2^(n/d-1).at n=21A373275