18004

Appears in sequences

• Symmetric square table of coefficients, read by antidiagonals, where T(n,k) is the coefficient of x^n*y^k in f(x,y) that satisfies: f(x,y) = g(x,y) + xy*f(x,y)^4 and where g(x,y) satisfies: 1 + (x+y-1)*g(x,y) + xy*g(x,y)^2 = 0.at n=40A089447
• Diagonal of square table A089447, which lists the coefficients of x^n*y^k in f(x,y) that satisfies: f(x,y) = g(x,y) + xy*f(x,y)^4 and where g(x,y) satisfies: 1 + (x+y-1)*g(x,y) + xy*g(x,y)^2 = 0.at n=4A089448
• Triangle read by rows: T(n,k) is number of ternary words of length n and having k runs of 0's of odd length (0 <= k <= ceiling(n/2); a run of 0's is a subsequence of consecutive 0's of maximal length).at n=36A119914
• Number of ternary words of length n and having exactly one run of 0's of odd length.at n=10A119915
• Triangle where g.f. of row n = Product_{i=0..n} [F(i+1) + F(i)*x] for n>=0, where F(i) = A000045(i) is the i-th Fibonacci number.at n=24A130405
• a(n) = Least i in range [A165598(n),A165598(n+1)] for which abs(A165597(i)) gets the maximum value in that range.at n=27A165599
• Number n such that the sum of its proper evil divisors (A001969) equals n.at n=26A230587
• Number of integers in n-th generation of tree T(2^(-1/3)) defined in Comments.at n=41A274158
• Expansion of 1/(1 - x * Sum_{k>=1} prime(k)*x^k).at n=13A307898
• Number of partitions p of n such that (number of numbers in p that have multiplicity 1) < (number of numbers in p having multiplicity > 1).at n=42A330001
• a(n) is the number of vertices formed by n-secting the angles of a heptagon.at n=40A335758