1300075

Appears in sequences

• Numerators in expansion of 1/sqrt(1-x).at n=13A001790
• Numerator of n!!/(n+1)!! (cf. A006882).at n=25A004730
• Numerator of average distance traveled by n-dimensional fly.at n=24A004734
• Denominator of rational part of Haar measure on Grassmannian space G(n,1).at n=26A036069
• Numerators in the Taylor series for arccosh(x) - log(2*x).at n=12A052468
• Numerators of Taylor series expansion of arcsin(x). Also arises from arccos(x), arccsc(x), arcsec(x), arcsinh(x).at n=13A055786
• Central binomial coefficient A001405(n) divided by its characteristic cube divisor A056201(n).at n=25A056202
• Bisection of A001790.at n=6A063079
• a(0) = 1; for n>0, if gcd(a(n-1),n) = 1 then a(n) = n*a(n-1) else a(n) = least integer multiple of a(n-1)/n.at n=26A094299
• Divide n! repeatedly by i! for i from floor(n/2) down through 2; a(n) = remaining quotient.at n=26A111866
• Numerators of coefficient of x^(n+1/2) in the series expansion of the haversine.at n=13A143581
• Denominators of the BG1[ -5,n] coefficients of the BG1 matrix.at n=13A162444
• Odd part of the swinging factorial A056040.at n=26A163590
• Denominator of sum of fractions A182972(k) / A182973(k) such that A182972(k) + A182973(k) = n.at n=23A245678
• Denominators of the terms of Lehmer's series S_2(2), where S_k(x) = Sum_{n>=1} n^k*x^n/binomial(2*n, n).at n=12A259853
• Numerator of (-1/3)^n*sqrt(Pi)/(Gamma(1/2 - n)*Gamma(1 + n)).at n=13A285019
• a(n) = denominator(n!! / (n - 1)!!).at n=26A380910