69638domain: NAppears in sequencesa(n) is the smallest natural number we cannot obtain from n, n+1, n+2, n+3, n+4, n+5, n+6, n+7 and the operators +, -, *, /, using each number only once.at n=20A143192a(n) is the number of terms in the n-th row of A360298.at n=32A360299