119910domain: NAppears in sequencesAntidiagonal sums of the convolution array A213773.at n=19A213818Smallest squarefree term of adjacent squarefree pairs in the sequence of practical numbers (A005153).at n=8A268156G.f. A(x) satisfies: 1 - x = Sum_{n>=0} (x^(3*n) + (-1)^n*A(x))^n.at n=21A352819