84320

Appears in sequences

• Number of diagonal polyominoes with n cells.at n=10A056841
• Lesser of two consecutive numbers each divisible by a fifth power.at n=22A068783
• Number of non-equivalent n-fold branched coverings of the projective plane with two cyclic branch points.at n=9A113947
• Expansion of 1/(1+x^2-x^3+x^4).at n=53A129903
• Index of the first superabundant number k having abundance >= n.at n=17A240074
• Number of Carlitz compositions of n with exactly one descent.at n=36A241691
• a(n) = 3*a(n-1) - 3*a(n-2) + 2*a(n-3) - 2*a(n-4) + a(n-5) for n >= 10, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 20, a(5) = 32, a(6) = 50, a(7) = 77, a(8) = 116, a(9) = 174.at n=25A289115