704512

Appears in sequences

• Expansion of (1+3*x+4*x^2)/(1-4*x^2+4*x^4).at n=28A058582
• a(n) = 4^(n-2)*n*(5*n+3)/2.at n=8A084901
• a(n) = (3*n+1)*2^n.at n=14A130129
• G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} T(n,k)^2 * x^k] / A(x)^n * x^n/n ), where T(n,k) is the coefficient of x^k in (1 + x + 2*x^2)^n.at n=31A251687
• a(n) = prime(n) * 2^n.at n=13A265127
• Number of solutions to 1 +- 3 +- 6 +- ... +- n*(n+1)/2 == 0 mod n.at n=23A300307
• Numbers whose product of prime indices equals their product of prime exponents (prime signature).at n=30A353503
• Positions of records in A375202.at n=30A375203
• a(n) = Sum_{k=0..floor(n/3)} 2^(n-k) * binomial(k,n-3*k)^2.at n=19A387484