18096

Appears in sequences

• Coordination sequence for D_6 lattice.at n=4A008357
• Even octagonal numbers: a(n) = 4*n*(3*n-1).at n=39A014642
• Triangle of Fibonomial coefficients (k=2).at n=30A034801
• Triangle of Fibonomial coefficients (k=2).at n=33A034801
• A convolution triangle of numbers obtained from A025749.at n=41A049213
• Integers n > 7059 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 7059.at n=37A063058
• Number of basis partitions (or basic partitions) of n.at n=54A066447
• Numbers k such that the number of steps to reach 1 in '3x+1' problem equals tau(k), the number of divisors of k.at n=27A070980
• Numbers n such that sopf(sigma(n)) = sigma(sopf(n)), where sopf(x) = sum of the distinct prime factors of x.at n=31A076532
• Expansion of 1 / (1 + x^2 - x^3) in powers of x.at n=57A077961
• Expansion of 1/(1 + 2*x + x^2 - x^3).at n=27A077990
• Fourth column (m=5) of array A090452.at n=7A090454
• a(n) = 8*a(n-1) - 8*a(n-2) + a(n-3), with a(1) = 1, a(2) = 8, a(3) = 56.at n=5A092521
• Least area of primitive Pythagorean triangle whose legs differ by A058529(n).at n=37A094143
• Square array T(n,k) read by antidiagonals: coordination sequence for lattice D_n.at n=25A103903
• Octagonal numbers for which the product of the digits is also an octagonal number.at n=33A117083
• Shifts 2 places left under Dirichlet convolution.at n=30A144366
• Alternating sum of the squares of the first n even-indexed Fibonacci numbers.at n=6A156088
• Number of permutations of 1..n containing the relative rank sequence { 132645 } at any spacing.at n=3A159091
• Number of permutations of 1..n containing the relative rank sequence { 213564 } at any spacing.at n=3A159140