4456448

Appears in sequences

• Generalized tangent numbers d(4,n).at n=3A000318
• Generalized tangent numbers d_(n,4).at n=3A000518
• a(n) = n*(n+1)*2^(n-2).at n=16A001788
• a(n) = n*2^n - 2^n = 2^n*(n-1).at n=17A058922
• 19-almost primes (generalization of semiprimes).at n=17A069280
• Denominators in the Maclaurin series for arctan(1+x).at n=33A075554
• a(n) = 17*2^n.at n=18A110287
• a(n)=Floor(n*2^(n/2)).at n=33A128441
• a(n) = n*2^floor((n+1)/2).at n=34A132314
• a(n) = n*2^(floor(n/2)).at n=34A132344
• Binomial transform of A008805 (triangular numbers with repeats).at n=18A158920
• a(0)=8, a(n) = 2*a(n-1) + 2^(n-1) for n > 0.at n=18A159696
• Numbers with 38 divisors.at n=5A175747
• a(n) = n*4^(n/2 - 1)*(9 + (-1)^n).at n=17A187274
• (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=25A203167
• Shanks's array d_{a,n} (a >= 1, n >= 1) that generalizes the tangent numbers, read by antidiagonals upwards.at n=24A235606
• G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} T(n,k)^2 * x^k] / A(x)^n * x^n/n ), where T(n,k) is the coefficient of x^k in (1 + x + 2*x^2)^n.at n=36A251687
• Denominators of a BBP-like formula for 4*Pi/sqrt(27).at n=5A260659
• Triangle for denominators of coefficients for integrated odd powers of cos(x) in terms sin((2*m+1)*x).at n=53A273172
• 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 22", based on the 5-celled von Neumann neighborhood.at n=36A285437