22005

Appears in sequences

• Least k such that first k terms of A022303 contain n more 2's than 1's.at n=14A025518
• a(n) = floor(a(n-2)^2/a(n-1)) + a(n-1) + a(n-2), a(0) = 0, a(1) = 1, a(2) = 1, ...at n=18A096081
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.at n=48A136900
• Expansion of x/((1-x)^2(1+x-x^3-x^4-x^5-x^6-x^7+x^9+x^10)).at n=49A143611
• Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 5.at n=7A154049
• G.f.: exp( Sum_{n>=1} a(n)*x^n/n ) = Product_{n>=1} (1 + a(n-1)*x^n).at n=8A157311
• a(n) = (1/n) * Sum_{k=0..n-1} (8k+5) T_k^2, where T_0, T_1, ... are central trinomial coefficients given by A002426.at n=5A179100
• Number of distinct values of Sum_{i=0..n} x(i)*binomial(n,i), where the x(i) is a vector of length n+1 that runs through all combinations of {0, 1}.at n=19A205536
• Triangular array: Row n shows the coefficients of polynomials p(n,x) defined in Comments.at n=46A249057
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 137", based on the 5-celled von Neumann neighborhood.at n=33A270276
• a(n) is the least number k such that the k-th difference between consecutive practical numbers, A179651(k), equals 2*n, or -1 if no such k exists.at n=23A364706
• Number of integer partitions of n that cannot be partitioned into a set of sets.at n=42A382078