195898domain: NAppears in sequencesa(n) = 1 + F(2*n+1) + (-1)^n*L(n).at n=13A006172Second entry in row n of triangle in A169940.at n=39A169943Strings of 6 digits from 1...9, such that no formula using the single digits in the given order exists that evaluates to 0.at n=12A288356