2228224

Appears in sequences

• Coefficients of Chebyshev polynomials: n*(2*n+1) * 4^(n-1).at n=7A002700
• Theta series of D*_17 lattice.at n=25A022070
• a(n) = n*2^n.at n=17A036289
• a(n) = 2^(n-2)*binomial(n+1,2).at n=14A052482
• Triangle of coefficients of Chebyshev's U(n,2*x-1) polynomials (exponents of x in increasing order).at n=52A053124
• Triangle of coefficients of Chebyshev's U(n,2*x-1) polynomials (exponents of x in decreasing order).at n=47A053125
• Products of exactly 18 primes (generalization of semiprimes).at n=17A069279
• Numbers k such that phi(k) is a perfect tenth power.at n=18A078170
• a(i) = the number of occurrences of 9's in the palindromic compositions of n=2*i-1 = the number of occurrences of 10's in the palindromic compositions of n=2*i.at n=16A079862
• Sequence associated with a(n) = 2*a(n-1) + k*(k+2)*a(n-2).at n=15A080929
• Inverse binomial transform of n*Pell(n).at n=34A093968
• Expansion of (1 - 4*x + 6*x^2)/(1 - 2*x)^2.at n=18A097064
• a(n) = 4^(n-1)*Fibonacci(n).at n=9A099133
• a(n) = prime(n)*2^prime(n).at n=6A100042
• a(n) = n-th n-almost prime.at n=17A101695
• a(n) = 17*2^n.at n=17A110287
• Denominator of (ordinary) expansion of log((x/2-1)/(x-1)).at n=17A131135
• Row sums of triangle A134400.at n=17A134401
• Triangle T, read by rows, where column 0 of T^m equals C(m*2^(n-1), n) as n=0,1,2,3,..., for all m.at n=33A136467
• a(n) = (2^prime(n) + 2^prime(n+1)) / 4.at n=7A137781