191541domain: NAppears in sequencesG.f. A(x) satisfies: 1 = Product_{n>=1} (1 - x^n) * (1 - x^(n+1)/A(x)) * (1 - x^(n-2)*A(x)).at n=14A268651Number of labeled simple connected graphs covering a subset of {1..n} with at least one non-endpoint bridge (non-spanning edge-connectivity 1).at n=7A327231