54214domain: 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=8A143192a(n) = tribonacci(n) modulo Fibonacci(n).at n=25A335534Expansion of 1/(1 - x/(1 - 4*x)^(3/2))^3.at n=6A382542