34459425

Appears in sequences

• Double factorial of odd numbers: a(n) = (2*n-1)!! = 1*3*5*...*(2*n-1).at n=9A001147
• Triangle of coefficients of Bessel polynomials (exponents in decreasing order).at n=45A001497
• Triangle of coefficients of Bessel polynomials (exponents in decreasing order).at n=46A001497
• Triangle a(n,k) (n >= 0, 0 <= k <= n) of coefficients of Bessel polynomials y_n(x) (exponents in increasing order).at n=53A001498
• Triangle a(n,k) (n >= 0, 0 <= k <= n) of coefficients of Bessel polynomials y_n(x) (exponents in increasing order).at n=54A001498
• Double factorials n!!: a(n) = n*a(n-2) for n > 1, a(0) = a(1) = 1.at n=17A006882
• Smallest k such that k*n is a double factorial.at n=18A007919
• Triangle of coefficients in expansion of (x+1)*(x+3)*...*(x + 2n - 1) in rising powers of x.at n=45A028338
• The convolution matrix of the double factorial of odd numbers (A001147).at n=36A035342
• Highly composite odd numbers: odd numbers where d(n) increases to a record.at n=28A053624
• 2-adic factorial function.at n=18A055634
• Volume of n-dimensional sphere of radius r is V_n*r^n = Pi^(n/2)*r^n/(n/2)! = C_n*Pi^floor(n/2)*r^n; sequence gives denominator of C_n.at n=17A072346
• Surface area of n-dimensional sphere of radius r is n*V_n*r^(n-1) = n*Pi^(n/2)*r^(n-1)/(n/2)! = S_n*Pi^floor(n/2)*r^(n-1); sequence gives denominator of S_n.at n=19A072479
• a(n) = (n+1)*a(n-2) with a(0) = a(1) = 1.at n=16A081405
• Double factorial of primes.at n=6A091835
• Row 4 of array in A288580.at n=17A092398
• Denominators of Pi * average length of a line segment picked at random in the unit n-ball for even n.at n=3A093533
• Coefficients of polynomial in x multiplying cosh(x) in the modified spherical Bessel function of the first kind i_n(x).at n=48A094675
• a(n) = Product_{i=1..2*n} (2*i+1).at n=4A103639
• Square of P(n,t) read by antidiagonals. P(n,t) = number of ways to split [t*n] into n arithmetic progressions each with t terms.at n=53A104443