2162688

Appears in sequences

• Expansion of g.f. (1+2*x)/(1-2*x)^2.at n=16A014480
• Triangle whose (i,j)-th entry is binomial(i,j)*8^(i-j)*11^j.at n=22A038289
• Triangle whose (i,j)-th entry is binomial(i,j)*11^(i-j)*8^j.at n=26A038322
• Products of exactly 18 primes (generalization of semiprimes).at n=15A069279
• a(n) is the smallest x such that the quotient d(x)/d(x+1) equals n, where d = A000005.at n=16A080372
• Expansion of (1-3x+4x^2-3x^3+x^4)/(1-2x)^2.at n=19A084861
• Inverse binomial transform of n*Pell(n).at n=33A093968
• a(n) = n*2^(floor(n/2)).at n=33A132344
• Binomial transform of [1, 2, -3, -4, 5, 6, -7, -8, 9, 10, ...].at n=32A140230
• Denominators of a series expansion for Pi/2.at n=24A156269
• a(0)=8, a(n) = 2*a(n-1) + 2^(n-1) for n > 0.at n=17A159696
• Denominators of a BBP series for Pi/4.at n=16A164916
• (n-1)-st elementary symmetric function of the first n terms of (2,2,1,2,2,1,2,2,1,...)=(A130196 for n>0).at n=24A203167
• Lexicographically earliest sequence such that (i) the binary plot of the sequence is symmetric with respect to the line y=x and (ii) the derived sequence (A000265(a(n))) contains only distinct terms.at n=17A240972
• Median of 2^X + 2^Y where X and Y are independent random variables with B(n,1/2) distributions.at n=37A288346
• Binomial transform of [0, 1, 2, -3, -4, 5, 6, -7, -8, ...].at n=33A316386
• 4-parking triangle T(r, i, 4) read by rows: T(r, i, k) = (r + 1)^(i-1)*binomial(k*(r + 1) + r - i - 1, r - i) with k = 4 and 0 <= i <= r.at n=33A329060
• a(n) is the smallest number m such that tau(m) = n*tau(m-1) = n*tau(m+1) or 0 if no such m exists, where tau(k) = A000005(k).at n=16A350936
• a(n) is the smallest integer that has exactly n odious divisors (A227872) and n evil divisors (A356018).at n=33A356040
• a(n) is the square of the side length of a simplex whose n-dimensional inner hypervolume is equal to its (n-1)-dimensional surface hypervolume. As a result, the sequence starts at n=2.at n=30A364922