1245184

Appears in sequences

• a(n) = (n+2)*2^(n-1).at n=17A001792
• Denominators of Taylor series expansion of arcsin(x). Also arises from arccos(x), arccsc(x), arcsec(x), arcsinh(x).at n=9A002595
• a(n) = Sum_{k=0..floor(n/2)} k*binomial(n,2*k) = floor(n*2^(n-3)).at n=19A049610
• 17-almost primes (generalization of semiprimes).at n=20A069278
• a(n) = - 2*a(n-1) - 8*a(n-3), a(0) = 1, a(1) = 1, a(2) = -2.at n=17A106603
• a(n) = 19*2^n.at n=16A110288
• Triangle T, read by rows, such that T^2 = SHIFT-UP(T); i.e., the matrix square of T shifts each column of T up 1 row, dropping the main diagonal consisting of the powers of 2: [T^2](n,k) = T(n+1,k) with T(n,n) = 2^n for n>=k>=0.at n=32A118022
• Coefficient table for Chebyshev's U(2*n,x) polynomials in decreasing powers of (1-x^2).at n=46A127675
• Numbers k such that phi(k) = number of perfect partitions of (k-1).at n=27A166156
• Inverse binomial transform of A026741.at n=19A168150
• Numbers with 34 divisors.at n=6A175744
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of max(3i-j, 3j-i), as in A204156.at n=44A204157
• Number of compositions of n with at most one odd part.at n=35A211164
• Row sums of A211226.at n=34A211227
• Numbers m such that, in the prime factorization of m, the product of the prime factors equals the sum of prime factors and exponents.at n=22A231293
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 219", based on the 5-celled von Neumann neighborhood.at n=20A286769
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 283", based on the 5-celled von Neumann neighborhood.at n=20A287493
• Consider the Watanabe tag system defined in A291067; a(n) = number of binary words of length n which terminate in a cycle.at n=20A291781
• Number of inseparable multisets of size n covering an initial interval of positive integers.at n=36A336102
• Number of inseparable multisets of size n covering an initial interval of positive integers.at n=37A336102