18316

Appears in sequences

• Number of degree-n even permutations of order dividing 2.at n=11A000704
• a(n) = (n^3 + 2*n)/3.at n=38A006527
• Engel expansion of the golden ratio, (1 + sqrt(5))/2 = 1.61803... .at n=19A028259
• Engel expansion of sqrt(5) = 2.23606...at n=19A059176
• Sum of the first moments of all partitions of n with weights starting at 0.at n=19A066185
• Product L(n)*S(n), where L(n) are Lucas numbers and S(n) are Lucas 3-step numbers = A000032(n) * A001644(n).at n=9A073446
• a(n) = first term which reduces to an unchanging value in n steps via repeated interpretation of a(n) as a base b+1 number where b is the largest digit of a(n).at n=16A091049
• 28-gonal numbers: a(n) = n*(13*n - 12).at n=38A161935
• One third of product plus sum of three consecutive nonnegative integers; a(n)=(n+1)(n^2+2n+3)/3.at n=37A167875
• Smallest value of k for which 6*k+1 divides the subset of centered hexagonal terms included in A177019 that admit only factors like 6*k+1.at n=13A178509
• G.f.: q-sinh(x) evaluated at q=-x.at n=42A198202
• Number of (w,x,y,z) with all terms in {1,...,n} and 2|w-x|=n+|y-z|.at n=38A212686
• Numbers m such that phi(m) = k*phi(m-k) for some number 1 <= k < m - 2.at n=41A266267
• Numbers that are not the difference of two binary palindromes (A006995).at n=41A290393
• Solutions to A000010(x) + A000010(x-1) = A000010(2*x).at n=12A299535
• Number of rectangular plane partitions of n with no repeated rows or columns.at n=30A323435
• Number of non-isomorphic connected multiset partitions of weight n into singletons or pairs.at n=15A368726
• Array read by antidiagonals: A(n,k) is the number of achiral planar maps with n vertices and k faces, n >= 1, k >= 1.at n=49A379431
• Array read by antidiagonals: A(n,k) is the number of achiral planar maps with n vertices and k faces, n >= 1, k >= 1.at n=50A379431