197568

Appears in sequences

• Almost trivalent maps.at n=3A002010
• High-temperature expansion of Ising model susceptibility chi_4 for square lattice.at n=4A010045
• Non-perfect powers k for which q = A051903(k)/A051904(k) is an integer, A051904(k) > 1.at n=26A093770
• Powerful numbers (definition 1) sandwiched between twin primes.at n=18A113839
• Averages of twin prime pairs k such that k*7 and k/7 are squares.at n=8A154673
• Number of distinct (unordered) pairs of partitions of a 9-element set that have Rand distance n.at n=22A192102
• Molecular topological indices of the square graphs.at n=7A192839
• Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=10A208143
• Number n such that Fibonacci(n) is divisible by n, n + 1 and n - 1.at n=25A221018
• Integer areas A of the integer-sided triangles such that the inradius and the radius of the three excircles are perfect squares.at n=7A233317
• a(n) = 9*n^3.at n=28A244728
• E.g.f. satisfies: A(x)^A(x) = 1 + x*A(x).at n=9A349587
• Triangle read by rows. T(n, k) = (-1)^(n-k)*(k+1)*binomial(n, k)*pochhammer(1-n, n-k).at n=51A360205