540540

Appears in sequences

• Exponential generating function: 2*(1+3*x)/(1-2*x)^(7/2).at n=5A000906
• Expansion of 1/((1-x)(1-3x)(1-4x)(1-12x)).at n=5A021404
• Triangle of coefficients of Bessel polynomials {y_n(x)}'.at n=39A065931
• Triangle of coefficients of Bessel polynomials {y_n(x)}''.at n=31A065943
• First differences of A069473.at n=15A069474
• Triangle T(n,k) by rows: coefficient [x^(n-k)] of 2^n * n! *L(n,1/2,x), with L the generalized Laguerre polynomials in the Abramowitz-Stegun normalization.at n=25A098503
• Numbers n such that n = 12*reversal(n).at n=5A101705
• Denominators of first difference of squares of harmonic numbers A001008/A002805.at n=14A103933
• Smallest number having exactly n triangular divisors.at n=26A130317
• a(n) is found from a(n-1) by dividing by D-1 and multiplying by D, where D is the smallest number that is not a divisor of a(n-1).at n=39A133582
• Coefficients of a partition transform for Lagrange inversion of -log(1 - u(.)*t), complementary to A134685 for an e.g.f.at n=31A133932
• Numbers with exactly 6 distinct prime divisors {2,3,5,7,11,13}.at n=16A147573
• Sums of 2 distinct primorials.at n=26A177689
• Numbers with prime factorization pqrst^2u^3.at n=3A190390
• G.f. for Ehrhart quasi-polynomials for hyperplane arrangements of type E_6.at n=52A210634
• Triangle read by rows: labeled trees counted by improper edges.at n=35A217922
• Triangle S(n, k) by rows: coefficients of 2^((n-1)/2)*(x^(1/2)*d/dx)^n when n is odd, and of 2^(n/2)*(x^(1/2)*d/dx)^n when n is even.at n=49A223168
• Triangle S(n, k) by rows: coefficients of 2^((n-1)/2)*(x^(1/2)*d/dx)^n when n is odd, and of 2^(n/2)*(x^(1/2)*d/dx)^n when n is even.at n=50A223168
• Triangle S(n, k) by rows: coefficients of 2^((n-1)/2)*(x^(1/2)*d/dx)^n, where n = 1, 3, 5, ...at n=23A223523
• Triangle S(n, k) by rows: coefficients of 2^((n-1)/2)*(x^(1/2)*d/dx)^n, where n = 1, 3, 5, ...at n=22A223523