72514

Appears in sequences

• Number of nX7 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=2A301840
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=38A301841
• Number of 3Xn 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=6A301843
• a(n) = (7*n^6 - 21*n^5 + 55*n^4 - 75*n^3 + 70*n^2 - 36*n + 8)/8.at n=7A380502
• Expansion of (1/x) * Series_Reversion( x * (1 - x^2 / (1 - x)^2)^2 ).at n=10A389693