1225224

Appears in sequences

• Number of (2,2; n,n)-partitions of a chain of length n^2 + n.at n=6A055660
• a(n) = A081537(n)/A081535(n), with a(2) = 1 by convention.at n=18A081538
• a(n) = floor(lcm(1,2,...n)/(1+2+...+n)).at n=18A109922
• a(n) = lcm(1,2,3,...,prime(n))/(1 + 2 + ... + prime(n)).at n=6A109923
• Denominator of Sum_{k = 0..n} 1/((k+1)*(2*k+1)).at n=8A111876
• Denominator of rational part of raw moment n of the line point picking problem.at n=18A115389
• Denominators of partial sums of the alternating series of inverse central binomial coefficients.at n=8A145556
• Irregular triangle T giving the coefficients of x^n = x^{2*e2 + 3*e3} of (1 + x^2 + x^3)^n, with the pair of nonnegative numbers [e2, e3] listed in row n of A321201, for n >= 2.at n=34A321203
• a(n) is the least positive integer k such that it has exactly n triples of divisors (d1, d2, d3) such that they are pairwise coprime and d1 < d2 < d3 < 2*d1.at n=7A336629
• a(n) = lcm(denominator(p(n, x))), where p(n, x) are the rational polynomials defined in A342321.at n=17A343277
• a(n) = Product_{k = ceiling(n/2)..n-1} A090252(k).at n=11A354758