750000000domain: NAppears in sequencesa(n) = number of times n appears in the sequence (b(i)[1], i=1,2,3,4,...), where b(i) is defined in A318919.at n=11A318920a(n) = 1/Product_{i = 1..n} w_i, where w_i is the i-th weight factor for Laguerre-Gauss quadrature of degree n.at n=5A391956