3211264

Appears in sequences

• a(n) = 2^n*n^2.at n=14A007758
• Squares that are a difference between 2 positive cubes.at n=26A038596
• Expansion of (1+3*x+4*x^2)/(1-4*x^2+4*x^4).at n=32A058582
• Products of exactly 18 primes (generalization of semiprimes).at n=25A069279
• a(n) = -2*a(n-1) + 4*a(n-3), with a(0) = 1, a(1) = -2, a(2) = 4.at n=24A099211
• a(n) = (3*n+1)*2^n.at n=16A130129
• Numbers of the form j^k * k^j, where j,k > 1.at n=19A146748
• Lexicographically earliest sequence such that (i) the binary plot of the sequence is symmetric with respect to the line y=x and (ii) the derived sequence (A000265(a(n))) contains only distinct terms.at n=19A240972
• 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=35A251687
• a(n) = Sum_{k=0..2n}(k!*(2n - k)!)/(floor(k/2)!*floor((2n - k)/2)!)^2.at n=9A327999
• a(n) = Sum_{k=0..n}(k!*(n - k)!)/(floor(k/2)!*floor((n - k)/2)!)^2.at n=18A328000
• Number of minimum total dominating sets in the 2 X n king graph.at n=34A350817
• Integers k such that A008472(k) / A001222(k) = 1/2.at n=17A390139