70755

Appears in sequences

• Expansion of g.f. (1-x^2)/(1-x-2*x^2+x^3).at n=20A028495
• Expansion of (1-2*x)*(1-x)/(1-5*x+6*x^2-x^3).at n=10A052975
• Diagonal sums of number array A107249.at n=19A107250
• Let i be in {1,2,3} and let r >= 0 be an integer. Let p = {p_1, p_2, p_3} = {-2,0,1}, n = 2*r + p_i and define a(-2)=0. Then, a(n) = a(2*r + p_i) gives the quantity of H_(7,3,0) tiles in a subdivided H_(7,i,r) tile after linear scaling by the factor x^r, where x = sqrt(2*cos(Pi/7)).at n=41A187067
• Number of palindromic compositions of n with parts in {1,2,4,6,8,10,...}.at n=41A276055
• Least common multiple of 7*n+1 and 7*n-1.at n=38A282286