18684

Appears in sequences

• Number of Hamiltonian cycles in P_5 X P_{2n}.at n=4A006865
• Number of self-avoiding walks on a 2-D lattice of length n which start at the origin, take first step in the {+1,0} direction and whose vertices are always nonnegative in x and y.at n=11A046170
• Number of regions in regular n-gon which are quadrilaterals (4-gons) when all its diagonals are drawn.at n=32A067151
• Values of x in solutions (x,y,z) to the Diophantine equation x^3-x^2+y^3-y^2=z^3-z^2, with 1<x<y<z.at n=29A138667
• a(1)=4. a(n+1) = a(n)+d-1, where d is the smallest prime divisor of (a(n)-1)*(a(n)+1).at n=47A177929
• Number of Hamiltonian cycles in P_10 X P_n.at n=4A180504
• Expand 1/(8 - 8 x + 3 x^3 - 2 x^4) in powers of x, then multiply coefficient of x^n by 8^(1 + floor(n/3)) to get integers.at n=20A206568
• Expansion of phi(x^2) / f(-x) in powers of x where phi(), f() are Ramanujan theta functions.at n=31A226622
• Sum of the perimeters of all regions of the n-th section of a modular table of partitions.at n=26A278602
• Triangle read by rows: T(m,n) = number of Hamiltonian cycles on m X n grid of points (m >= 2, 2 <= n <= m).at n=39A321172
• Number of Hamiltonian cycles on an n X 2*n grid.at n=3A333864
• Fourier coefficients of the modular form (1/t_{3A}^2) * F_{3A}^12.at n=31A341558
• Expansion of (1 - x^4 - x^5)/((1 - x^4 - x^5)^2 - 4*x^9).at n=39A376731