-4732

Appears in sequences

• Reversion of 1 / sqrt(1 - 4*x) (the o.g.f. for the central binomial coefficients A000984) as if it were an e.g.f.at n=6A066397
• Riordan array ((1+x^2)/(1-x)^2, -x/(1-x)^2).at n=60A136672
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of f(i,j) = gcd(prime(i), prime(j)) (A204118).at n=23A204119
• a(1) = 1, a(2) = 3; a(n) = n^2 * Sum_{d|n, d < n} (-1)^(n/d) a(d) / d^2.at n=51A361986