241920

Appears in sequences

• Ratios of successive terms are 1,2,2,3,4,4,5,6,6,...at n=10A004527
• Dwork-Kontsevich sequence evaluated at 2*n.at n=6A007757
• a(n+1) = a(n)/n! if n! divides a(n) else a(n)*n!.at n=7A008338
• Expansion of e.g.f. tan(x^2)/2 in odd powers of x^2.at n=2A009767
• cos(arctan(x)*tan(x))=1-12/4!*x^4-7280/8!*x^8+241920/10!*x^10...at n=5A012448
• sech(arctan(x)*tan(x))=1-12/4!*x^4-560/8!*x^8+241920/10!*x^10...at n=5A012455
• a(n) = n!/lcm{1,2,...,n} = (n-1)!/lcm{C(n-1,0), C(n-1,1), ..., C(n-1,n-1)}.at n=13A025527
• Number of identity bracelets with n labeled beads of 2 colors.at n=7A032337
• One quarter of octo-factorial numbers.at n=4A034910
• Expansion of ( Sum_{k>=0} k*q^(k^2) )^8.at n=45A037217
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*4^j.at n=32A038222
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*3^j.at n=31A038233
• Triangle giving coefficients of (n+1)!*B_n(x), where B_n(x) is a Bernoulli polynomial. Rising powers of x.at n=38A048998
• Triangle giving coefficients of (n+1)!*B_n(x), where B_n(x) is a Bernoulli polynomial, ordered by falling powers of x.at n=42A048999
• Value of phi in arithmetic progression of at least 5 terms having the same value of phi in A050515.at n=4A050517
• Triangle read by rows: T(n,k) = n!*k.at n=33A051683
• E.g.f. x^3/(1-x)^2.at n=8A052571
• Expansion of e.g.f. (1+x-x^3)/((1-x)*(1-x^2)).at n=8A052687
• Expansion of e.g.f. (1-2*x-sqrt(1-4*x))/2 - x*(1-2*x-sqrt(1-4*x)) - x^2.at n=7A052715
• a(n) = gcd(n!, n!*(1 + 1/2 + 1/3 + ... + 1/n)).at n=13A056612