419430400

Appears in sequences

• a(n) = n*2^(n-1).at n=25A001787
• a(n) = 2^n*n^2.at n=20A007758
• a(n) = lcm(n, 2^(n-1)).at n=24A014964
• a(n) = 2^(2*n)*(2*n+1).at n=12A058962
• Start with the sequence [1, 1/2, 1/3, ..., 1/n]; form new sequence of n-1 terms by taking averages of successive terms; repeat until reach a single number F(n); a(n) = denominator of F(n).at n=24A090634
• Expansion of g.f. (1-4*x+5*x^2)/(1-2*x)^2.at n=26A097067
• Smallest number beginning with 4 and having exactly n prime divisors counted with multiplicity.at n=25A106424
• Column 0 of triangle A118441, which is the matrix log of triangle A118435.at n=25A118442
• Binomial transform of A004526.at n=26A139756
• Number of binary strings of length n with equal numbers of 0001 and 1000 substrings.at n=29A164161
• a(n) = sin((2*n+5)*Pi/6)*(n+1)*2^(n+1).at n=24A176900
• a(n) = n^2*2^(n^2-1).at n=5A185968
• Numbers k such that the sum of digits of k equals the concatenation of the distinct prime divisors of k.at n=13A212667
• Number of (possibly overlapping) occurrences of the subword given by the binary expansion of n in all binary words of length n.at n=29A228612
• Number of symmetry classes of 3-eared triangulations of an n-gon.at n=24A232492
• Denominators/48 of the coefficients of the series expansion of the Riemann-Siegel theta function at infinity.at n=12A282899
• 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 329", based on the 5-celled von Neumann neighborhood.at n=28A287717
• Squares that can be expressed as the sum of two positive squares but not as the sum of three positive squares.at n=12A309779