20028

Appears in sequences

• Number of polyhexes of class PF2 with four catafusenes annealated to pyrene.at n=5A030519
• Number of n X 4 0..7 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 8, and upper left element zero.at n=5A230911
• T(n,k)=Number of nXk 0..7 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 8, and upper left element zero.at n=41A230915
• a(0) = 0, a(1) = 1, for n > 1, a(n) = a(n-1) + a(n-A002487(n)).at n=28A283474
• Expansion of 1 / ((1-x)^3 - x^3)^2.at n=10A392584