13749310575
domain: N
Appears in sequences
- Double factorial of odd numbers: a(n) = (2*n-1)!! = 1*3*5*...*(2*n-1).at n=11A001147
- Double factorials n!!: a(n) = n*a(n-2) for n > 1, a(0) = a(1) = 1.at n=21A006882
- Smallest k such that k*n is a double factorial.at n=22A007919
- 2-adic factorial function.at n=22A055634
- 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=21A072346
- 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=23A072479
- a(n) = (n+1)*a(n-2) with a(0) = a(1) = 1.at n=20A081405
- a(n) = Product_{i=1..2*n} (2*i+1).at n=5A103639
- a(n) = (n-1)*a(n-2), a(0)=1, a(1)=0.at n=22A123023
- Q(2,n), where Q(m,k) is defined in A127080 and A127137.at n=21A127144
- A001147 with each term repeated.at n=22A133221
- A001147 with each term repeated.at n=23A133221
- List of pairs of numbers: {n^2-1, (2*n-1)!!} such that F((2*n-1)!!) = n^2 - 1.at n=21A154029
- Fibonacci(n)!!.at n=7A167444
- a(n) = Product_{k in M_n} k; M_n = {k | 1 <= k <= 2n and k mod 2 = n mod 2}.at n=11A190901
- Double factorials (prime(n)-2)!!.at n=8A207332
- Product of positive odd integers smaller than n and relatively prime to n.at n=22A209388
- a(n) = n!! mod !n.at n=19A216443
- a(n) = n!! mod n!at n=21A216466
- Union of the factorial numbers (A000142) and the double factorials of odd numbers (A001147).at n=22A248652