1049088

Appears in sequences

• a(n) = (2^n + 2^[ n/2 ] )/2.at n=19A001445
• Expansion of g.f.: x*(4-7*x+2*x^2-8*x^4+16*x^5-16*x^6)/((1-2*x) * (1-2*x^2) * (1-2*x+2*x^2) * (1+2*x^2)).at n=19A100213
• Expansion of (4 - 7*x + 2*x^2)/((1-2*x)*(1 - 2*x + 2*x^2)).at n=19A100215
• a(n) = 2^(2n) + 2^(n-1).at n=9A164051
• Number of set partitions of [n] such that the difference between each element and its index (in the partition) is a multiple of ten.at n=21A274867
• Number of classes of endofunctions of [n] under vertical translation mod n and reversal.at n=8A275551
• G.f. A(x) satisfies: A(x) = x + 2*A(x^2) + 4*A(x^3) + 8*A(x^4) + ... + 2^(k-1)*A(x^k) + ...at n=20A308076
• Numbers whose binary indices are all squarefree semiprimes.at n=17A371453