30604

Appears in sequences

• Number of triangular cacti with 2n+1 nodes (n triangles).at n=13A003081
• Consider a number n with m decimal digits. The sequence lists the numbers n having the suffix of length m-1 in the middle of the decimal expansion of n^2.at n=41A242964
• Expansion of f(x^2)^2 / f(-x) in powers of x where f() is a Ramanujan theta function.at n=39A260163
• Expansion of Sum_{i = p*q, p prime, q prime} x^i/(1 - x^i) / Product_{j>=1} (1 - x^j).at n=35A281612
• T(n, k) = Sum_{j=0..k} binomial(n, k - j)*Stirling1(n - k + j, j)*(-1)^(n-k). Triangle read by rows, T(n, k) for 0 <= k <= n.at n=39A341101
• Numbers k such that the ring of integers of Q(2^(1/k)) is not Z[2^(1/k)].at n=35A342390