245730

Appears in sequences

• a(n) = 2*n * Stirling2(n-1,2).at n=15A052749
• a(1)=1; for n>1, a(n) is the smallest positive integer for which sigma(a(n)) is a proper multiple of sigma(a(n-1)).at n=18A237352
• Row sums of A342000.at n=22A342020
• Triangle read by rows. Denominators of the coefficients of a sequence of rational polynomials r_n(x) with r_n(1) = B(2*n), where B(n) are the Bernoulli numbers.at n=29A356653